Understanding the World Health Organization’s Definition of Infection and Its Implications for Public Health

The World Health Organization (WHO) plays a crucial role in setting standards and providing guidance on various public health issues, including the definition of infection. According to WHO, an infection is the invasion and multiplication of harmful microorganisms, such as bacteria, viruses, or parasites, within a host organism.

Infections can occur in various parts of the body, from the respiratory tract to the urinary tract or even the bloodstream. They can range from mild, causing minor discomfort or symptoms, to severe, leading to life-threatening conditions or even death.

It is important to note that not all infections result in illness or disease. The human body has a defense mechanism, the immune system, which helps fight against these invading microorganisms. In some cases, the immune system successfully eliminates the infection without the individual experiencing any symptoms or becoming ill.

Understanding the definition of infection according to WHO is essential in the field of public health, as it allows for the development of strategies to prevent, control, and treat infections. By identifying the characteristics and causes of infections, healthcare professionals can implement appropriate measures to protect individuals and communities.

What Is Infection?

Infection is a process that occurs when a foreign organism, such as bacteria, viruses, fungi, or parasites, enters the body and causes harm. It is a complex interaction between the invading organism and the body’s immune system.

An infection can be classified as either localized or systemic. A localized infection is limited to a specific area of the body, such as a cut or wound, while a systemic infection affects the entire body, spreading through the bloodstream or lymphatic system.

Infections can result in a wide range of symptoms, depending on the type of organism involved and the location of the infection. Common signs of infection include fever, inflammation, pain, and swelling.

The Role of WHO in Infection Control

The World Health Organization (WHO) plays a crucial role in infection control by providing guidelines and recommendations for preventing and managing infections worldwide. WHO works closely with member states to develop strategies and policies that promote infection prevention and control in healthcare settings.

WHO also works to improve the surveillance and monitoring of infectious diseases, providing technical support and guidance to countries to strengthen their capacities in detecting and responding to outbreaks.

By promoting best practices and supporting research and innovation in the field of infection control, WHO aims to reduce the global burden of infectious diseases and ensure that everyone has access to safe and quality healthcare.

Understanding Infectious Diseases

Infectious diseases are illnesses caused by pathogens, such as bacteria, viruses, fungi, or parasites, that can be transmitted from one person to another. These diseases are a significant global health concern and can have severe consequences for individuals and communities.

The World Health Organization (WHO) defines an infection as the invasion and multiplication of pathogenic microorganisms in body tissues, which can lead to disease. The WHO plays a crucial role in monitoring infectious diseases worldwide, providing guidance on prevention, control, and treatment.

The Importance of Defining Infections

Defining infections is essential for understanding how they spread and designing effective strategies to prevent their transmission. By clearly defining infections, public health officials can implement measures to identify, contain, and treat infected individuals, reducing the impact of infectious diseases on a population.

Moreover, understanding the definition of infections aids in differentiating between various types of diseases. For example, some infections may have specific symptoms or patterns of transmission, which require specialized approaches for surveillance and control.

The Role of the World Health Organization (WHO)

The WHO plays a critical role in defining and managing infectious diseases. It collaborates with member states, research institutions, and other partners to collect data, conduct studies, and develop guidelines on infectious diseases. The organization’s efforts aim to improve the global response to outbreaks and promote the health and well-being of all individuals.

The WHO’s definition of infections serves as a reference for healthcare providers, scientists, and policymakers in understanding the nature and impact of these diseases. It enables the implementation of effective prevention strategies, the development of diagnostic tests, and the formulation of appropriate treatment protocols.

In conclusion, understanding infectious diseases and their definition by the WHO is crucial for effective public health measures. By comprehending the nature and transmission of infections, healthcare systems can better protect communities, mitigate the spread of diseases, and enhance overall population health.

Types of Infections

Infections, according to the World Health Organization (WHO), are defined as the invasion and multiplication of microorganisms such as bacteria, viruses, fungi, or parasites in the body. There are various types of infections that can affect different parts of the body and have different modes of transmission. Some common types of infections include:

Infection Type Description
Bacterial Infections Bacterial infections are caused by bacteria and can occur in various body parts such as the skin, respiratory system, urinary system, or gastrointestinal system.
Viral Infections Viral infections are caused by viruses and can range from common colds to more severe illnesses such as influenza, HIV/AIDS, or COVID-19.
Fungal Infections Fungal infections are caused by fungi and can affect the skin, nails, or mucous membranes. Examples include athlete’s foot, yeast infections, or ringworm.
Parasitic Infections Parasitic infections are caused by parasites and can lead to conditions such as malaria, intestinal worms, or scabies.
Respiratory Infections Respiratory infections affect the respiratory system and can include illnesses like pneumonia, bronchitis, or tuberculosis.
Urinary Tract Infections Urinary tract infections (UTIs) occur in the urinary system and are commonly caused by bacteria. They can affect the bladder, kidneys, or urethra.
Sexually Transmitted Infections Sexually transmitted infections (STIs) are infections transmitted through sexual contact. Common examples include chlamydia, gonorrhea, or syphilis.

These are just a few examples of the many types of infections that can occur. It’s important to practice good hygiene, follow proper preventive measures, and seek medical attention if you suspect you have an infection.

Causes of Infection

There are various causes of infection, ranging from bacteria and viruses to fungi and parasites. These infectious agents can enter the body through various routes, such as ingestion, inhalation, or through breaks in the skin.

Bacterial infections are often caused by harmful strains of bacteria, which can multiply and spread within the body, causing symptoms such as fever, pain, and inflammation.

Viral infections are caused by viruses, which can invade healthy cells and use them to replicate. This can lead to a wide range of symptoms, depending on the particular virus involved.

Fungal infections are caused by fungi, which can thrive in warm and humid environments. These infections commonly affect the skin, nails, and mucous membranes, and can cause symptoms such as itching, redness, and discomfort.

Parasitic infections are caused by parasites, which can live and reproduce in the body. These infections can be contracted through contaminated food or water, or through contact with infected individuals or animals. Symptoms can vary depending on the type of parasite involved.

Infection can also occur through direct contact with bodily fluids or contaminated surfaces, such as sharing needles or touching contaminated objects. Poor hygiene practices can also contribute to the spread of infection.

It is important to practice good hygiene, such as regular handwashing and proper food handling, to reduce the risk of infection. In addition, vaccines and proper medical care can also help prevent and treat infections.

Transmission of Infection

Infection is transmitted when a pathogen, such as a virus or bacteria, is transferred from one person or organism to another. Understanding how infections are transmitted is crucial for preventing the spread of diseases and implementing effective control measures.

Routes of Transmission

Infections can be transmitted through various routes, including:

  • Direct contact: Infections can spread through direct contact with an infected person or their bodily fluids, such as through touching, kissing, or sexual intercourse.
  • Indirect contact: Pathogens can be transmitted indirectly through contact with contaminated surfaces or objects. For example, touching a doorknob or using the same utensils as an infected person.
  • Airborne transmission: Some pathogens can spread through the air, especially when an infected person coughs, sneezes, or talks. The airborne particles containing the pathogens can be inhaled by others, leading to infection.
  • Vector-borne transmission: Infections can also be transmitted through vectors, such as mosquitoes or ticks, which carry the pathogens and transfer them to humans or animals when they bite.
  • Fecal-oral transmission: Contaminated food, water, or poor hygiene practices can lead to infections when pathogens from feces are ingested orally.

Preventing Transmission

The World Health Organization (WHO) emphasizes the importance of implementing effective infection prevention and control measures to break the chain of transmission. These measures include:

  1. Hand hygiene: Regularly washing hands with soap and water or using hand sanitizers can help to remove pathogens from the hands and prevent their transmission.
  2. Covering coughs and sneezes: Using a tissue or the elbow to cover coughs and sneezes can reduce the spread of respiratory droplets containing pathogens.
  3. Using personal protective equipment: Healthcare workers and individuals in high-risk environments should use appropriate personal protective equipment, such as masks, gloves, and gowns, to prevent direct contact with pathogens.
  4. Cleaning and disinfecting: Regularly cleaning and disinfecting surfaces and objects can help to eliminate pathogens and prevent indirect transmission.
  5. Safe food and water practices: Ensuring proper food handling, storage, and preparation, as well as maintaining clean water sources, can prevent fecal-oral transmission of infections.

By understanding the routes of transmission and implementing preventive measures, individuals and communities can reduce the risk of infection and contribute to overall public health.

Risk Factors for Infection

According to the definition of infection by the World Health Organization (WHO), there are several factors that can increase the risk of contracting an infection. These risk factors can vary depending on the type of infection and the individual’s susceptibility to it.

Some of the common risk factors for infection include:

  • Weakened immune system: Individuals with a weakened immune system, such as those with HIV/AIDS, cancer, or undergoing chemotherapy, are more susceptible to infections.
  • Age: Infants, young children, and the elderly have a higher risk of infection due to their developing or weakened immune systems.
  • Chronic conditions: People with chronic conditions such as diabetes, heart disease, or lung disease are more prone to infections as their bodies may have a harder time fighting off pathogens.
  • Exposure to infectious agents: Close contact with infected individuals, exposure to contaminated water or food, or working in healthcare settings increase the risk of infection.
  • Poor hygiene practices: Not washing hands regularly, improper food handling, and unsanitary living conditions contribute to the spread of infections.
  • Travel and geographic location: Traveling to areas with a higher prevalence of certain infections, or living in regions where certain diseases are endemic, can increase the risk of infection.

It is important to be aware of these risk factors and take appropriate measures to minimize the risk of infection. Practicing good hygiene, maintaining a healthy lifestyle, and seeking medical advice when necessary can help protect against infections.

Signs and Symptoms of Infection

According to the World Health Organization (WHO), an infection is defined as the invasion and multiplication of pathogens in a host organism’s tissues, leading to the manifestation of signs and symptoms.

Infections can vary in their presentation, depending on the type of pathogen and the body systems affected. However, there are common signs and symptoms that can indicate the presence of an infection:


Fever is a common symptom of infection and is often the body’s response to help fight off the invading pathogens. An elevated body temperature can indicate an infection, as the body increases its metabolic rate to create a hostile environment for the pathogens.

Localized Inflammation

Inflammation is a protective response by the body to an infection. It is characterized by redness, swelling, heat, and pain in the affected area. Inflammation occurs as a result of increased blood flow to the site of infection, which carries immune cells to fight off the pathogens.

Other common signs and symptoms of infection may include:

  • Malaise or fatigue
  • Headache
  • Chills and shivering
  • Coughing or sneezing
  • Sore throat
  • Nausea and vomiting
  • Diarrhea
  • Increased heart rate
  • Difficulty breathing
  • Changes in urine output

If you experience any of these signs and symptoms, it is important to seek medical attention. Proper diagnosis and treatment are crucial in managing and controlling infections.

Remember, early detection and intervention can help prevent the spread of infection and promote a faster recovery.

Diagnosis of Infection

The diagnosis of an infection is typically determined through various methods and tests. The World Health Organization (WHO) defines infection as the invasion and multiplication of pathogenic microorganisms in the body, which can lead to clinical manifestations and illness.

When diagnosing an infection, healthcare providers may use a combination of clinical examination, laboratory tests, and imaging studies. Clinical examination involves assessing symptoms, such as fever, cough, or rash, and conducting a physical examination to identify any signs of infection, such as inflammation or swelling.

Laboratory tests play a crucial role in confirming the presence of an infection. These tests may include blood tests, urine tests, or cultures of body fluids or tissues. Blood tests can detect specific antibodies or antigens related to the infecting organism, while urine tests can identify the presence of bacteria or viruses. Cultures involve growing and identifying microorganisms from a sample, which can help determine the specific pathogen causing the infection.

In some cases, imaging studies may be necessary to further evaluate the extent and location of an infection. These studies can include X-rays, computed tomography (CT) scans, or magnetic resonance imaging (MRI) scans, depending on the suspected site and nature of the infection.

Overall, diagnosing an infection involves a combination of clinical assessment, laboratory tests, and imaging studies to determine the presence, cause, and extent of the infection. Accurate and timely diagnosis is crucial for appropriate treatment and management of infections.

Treatment of Infection

When it comes to the treatment of infection, the World Health Organization (WHO) recommends a comprehensive approach that includes both preventive measures and targeted interventions to control and eliminate the spread of infectious diseases.

Preventive Measures

  • Good hygiene practices: Proper handwashing and sanitation techniques can significantly reduce the risk of infection.
  • Immunizations: Vaccines play a crucial role in preventing the spread of infectious diseases.
  • Vector control: In cases where infections are transmitted by vectors, such as mosquitoes, effective control measures like insecticide-treated bed nets and indoor residual spraying can help prevent the transmission of diseases.
  • Safe food handling: Following safe food handling practices can reduce the risk of foodborne infections.
  • Safe sex practices: Using barrier methods, such as condoms, can help prevent the transmission of sexually transmitted infections.

Treatment Interventions

While preventive measures are crucial, timely and appropriate treatment interventions are also necessary to address existing infections. Treatment options may vary depending on the specific infectious disease, but some common interventions include:

  • Antibiotics: Antibiotics are used to treat bacterial infections and work by killing or inhibiting the growth of bacteria.
  • Antiviral drugs: Antiviral drugs are used to treat viral infections and work by inhibiting the replication of the virus.
  • Antifungal drugs: Antifungal drugs are used to treat fungal infections and work by targeting the fungal cells.
  • Antiparasitic drugs: Antiparasitic drugs are used to treat parasitic infections and work by killing or inhibiting the growth of parasites.
  • Symptomatic treatment: In some cases, treatment may focus on relieving symptoms and providing supportive care to alleviate discomfort and help the body fight off the infection.
  • Surgery: In certain situations, surgical intervention may be necessary to remove infected tissues or drain abscesses.

It’s important to note that the appropriate treatment for an infection should always be prescribed by healthcare professionals based on the specific diagnosis and individual circumstances. Self-medication or prolonged use of antibiotics without medical supervision can lead to drug resistance and other complications.

Prevention of Infection

The World Health Organization (WHO) provides guidelines and recommendations for preventing infections. These measures are crucial in reducing the spread of infectious diseases and protecting individuals and populations.

Here are some key strategies recommended by WHO to prevent infection:

  • Frequent handwashing: WHO emphasizes the importance of washing hands with soap and water or using alcohol-based hand sanitizers regularly. Proper hand hygiene can prevent the transmission of pathogens.
  • Vaccination: Immunization plays a critical role in preventing various infectious diseases. WHO recommends timely vaccinations to protect individuals and communities from vaccine-preventable illnesses.
  • Infection control in healthcare settings: WHO provides guidelines for healthcare facilities to implement appropriate infection prevention and control measures. This includes proper handling of medical waste, sterilization of medical equipment, and adopting strict hand hygiene practices.
  • Safe food practices: WHO advocates for safe food handling and preparation techniques to prevent foodborne illnesses. This includes proper storage, cooking, and handling of food to avoid contamination with pathogens.
  • Respiratory hygiene: WHO advises individuals to practice good respiratory hygiene, such as covering the mouth and nose with a tissue or elbow when coughing or sneezing. This helps reduce the spread of respiratory infections, including respiratory droplets containing viruses.
  • Safe water and sanitation: Access to clean and safe drinking water, as well as adequate sanitation facilities, is essential for preventing waterborne diseases. WHO promotes proper sanitation practices and the use of clean water sources to reduce the risk of infection.
  • Safe sex practices: WHO encourages practicing safe sex to prevent the transmission of sexually transmitted infections (STIs). This includes condom use, regular STI testing, and open communication about sexual health.

By following these preventive measures recommended by WHO, individuals and communities can minimize the risk of infections and contribute to overall public health.

Infection Control Measures

Infection control measures refer to a series of actions and practices aimed at preventing the spread of infections in healthcare settings. These measures are implemented to protect both healthcare workers and patients from acquiring and transmitting infectious diseases.

The World Health Organization (WHO) plays a significant role in establishing guidelines and recommendations for infection control measures. The WHO defines infection control as the “scientific approach and practical measures used to prevent the spread of infections in healthcare settings.”

These measures typically include practices such as proper hand hygiene, cleaning and disinfection of medical equipment and surfaces, and appropriate use of personal protective equipment (PPE). In addition, healthcare facilities may implement protocols for waste management, isolation precautions, and surveillance and monitoring of infections.

Effective infection control measures are crucial in preventing healthcare-associated infections (HAI) and the spread of antimicrobial resistance. They contribute to improved patient safety, better outcomes, and reduced healthcare costs.

It is important for healthcare providers and staff to be knowledgeable about and consistently follow infection control measures. By implementing these measures, healthcare settings can minimize the risk of infections and create safe environments for both patients and healthcare workers.

Importance of Hand Hygiene

Hand hygiene plays a crucial role in preventing the spread of infections, according to the World Health Organization (WHO). Proper hand hygiene is vital as it helps reduce the risk of acquiring and transmitting various diseases, including respiratory infections, foodborne illnesses, and healthcare-associated infections.

The WHO emphasizes the importance of hand hygiene as a simple and effective way to protect oneself and others from infections. Washing hands with soap and water is a basic yet powerful action that can significantly reduce the transmission of pathogens.

Hand hygiene is particularly important in healthcare settings, where healthcare professionals come into contact with patients and potentially harmful pathogens on a regular basis. Following proper hand hygiene practices, such as washing hands before and after patient contact, helps prevent the spread of healthcare-associated infections, protecting both patients and healthcare workers.

In addition to healthcare settings, hand hygiene is also crucial in everyday life. People touch various surfaces and objects throughout the day, many of which may harbor infectious agents. By practicing good hand hygiene, individuals can reduce the risk of introducing these pathogens into their bodies or spreading them to others.

The WHO recommends washing hands with soap and water for at least 20 seconds, making sure to cover all parts of the hands, including the palms, back of the hands, fingers, and nails. If soap and water are not readily available, using an alcohol-based hand sanitizer containing at least 60% alcohol is an alternative option.

In conclusion, hand hygiene is a fundamental practice for preventing the spread of infections. It is a simple yet powerful measure that individuals can take to protect themselves and others from various diseases. By making hand hygiene a habit, we can significantly reduce the transmission of pathogens and contribute to better overall public health.

Vaccine Development for Infections

Vaccines are one of the most effective tools in preventing and controlling infectious diseases. The World Health Organization (WHO) defines a vaccine as a biological preparation that stimulates the immune system to recognize and fight against specific pathogens, such as bacteria or viruses, that cause infections.

Vaccine development involves a rigorous process that includes various stages, from preclinical testing to clinical trials before it can be approved for use. The development process aims to create vaccines that are safe, effective, and long-lasting.

Scientists and researchers follow specific steps in vaccine development. Firstly, they identify the pathogen responsible for the infection and study its characteristics. This information helps them to determine the most suitable vaccine approach, such as using inactivated or weakened forms of the pathogen, or specific components of the pathogen.

After selecting the vaccine approach, scientists develop the vaccine in the laboratory. They test its safety and effectiveness in preclinical studies using animals before moving on to clinical trials involving humans.

Clinical trials are conducted in multiple phases to assess the vaccine’s safety, immune response, and efficacy. These trials involve thousands of participants and are carefully monitored to evaluate the vaccine’s ability to protect against the targeted infection.

If the vaccine successfully completes all the phases of clinical trials and demonstrates safety and efficacy, it can be submitted for regulatory approval. Regulatory agencies review the data from the trials and conduct further evaluations to determine whether the vaccine meets the requirements for licensure.

Once approved, the vaccine can be manufactured on a large scale and distributed for use. Vaccination campaigns are often implemented to ensure widespread access to the vaccine, especially in populations at high risk of infection.

Vaccine development for infections plays a crucial role in preventing the spread of diseases and reducing their impact on global health. Continuous research and development efforts are necessary to combat emerging infectious diseases and enhance existing vaccines to provide better protection.

Benefits of Vaccines Challenges in Vaccine Development
  • Prevent infections
  • Reduce disease severity
  • Minimize hospitalizations
  • Protect vulnerable populations
  • Finding suitable vaccine targets
  • Addressing vaccine hesitancy
  • Ensuring vaccine affordability and accessibility
  • Developing vaccines for emerging diseases

Global Impact of Infections

Infections have a significant global impact on public health, economies, and social well-being. According to the World Health Organization (WHO), infections are defined as the invasion and multiplication of microorganisms in an individual’s body, which can cause mild to severe illness.

Infections can spread rapidly from person to person, leading to outbreaks and epidemics. The impact of infectious diseases is not limited to individual health; it extends to communities, countries, and even continents. In some cases, infections can result in large-scale pandemics, affecting millions of people worldwide.

Public Health

The burden of infections on public health is immense. Infectious diseases are one of the leading causes of illness, disability, and death globally. The WHO estimates that approximately one-third of all deaths worldwide are due to infectious diseases.

Infections can strain healthcare systems, as hospitals and healthcare providers must handle an influx of patients. They require resources such as isolation units, personal protective equipment, and diagnostic tools to identify and treat infected individuals effectively.

Preventing and controlling infections are high priorities for public health authorities. Vaccination campaigns, public health education, and improved sanitation practices play crucial roles in reducing the global impact of infections. Additionally, surveillance systems and early detection measures aid in containing outbreaks and preventing their spread.


Infections also have a significant impact on economies. Outbreaks of infectious diseases can disrupt trade, travel, and tourism, affecting local and global economies. Restrictions and quarantine measures implemented to prevent the spread of infections can lead to closures of businesses and institutions, causing financial losses and unemployment.

Furthermore, the cost of healthcare associated with treating infections and the productivity losses due to illness can strain economies. Infectious diseases may require long-term treatments and hospitalizations, imposing a financial burden on individuals, families, and governments.

Social Well-being

Infections can also have profound social consequences. They can disrupt daily life, causing fear and anxiety among the population. Outbreaks can lead to stigmatization and discrimination against infected individuals or communities, hindering social cohesion and trust.

Moreover, infections can impact education systems, as schools and universities may need to close temporarily during outbreaks. This interruption in education can have long-term effects on individuals’ learning and development.

In conclusion, infections have a complex and far-reaching impact on a global scale. Addressing the global burden of infections requires a multi-faceted approach involving public health measures, economic considerations, and promoting social well-being. The WHO’s definition of infections helps guide these efforts and ensures a common understanding of the challenges posed by infectious diseases.

Infection Prevention and Control Guidelines by WHO

Infection prevention and control are critical components of healthcare delivery and public health measures, particularly in the face of emerging infectious diseases. The World Health Organization (WHO) provides guidelines and recommendations to promote effective infection prevention and control practices globally.

According to the WHO, infection prevention and control measures aim to prevent the transmission of infectious agents between individuals and reduce the risk of healthcare-associated infections. These measures include hand hygiene, proper use of personal protective equipment (PPE), safe injection practices, sterilization and disinfection of medical equipment, and vaccination.

One of the key aspects of infection prevention and control is the adherence to standard precautions, which are basic infection prevention measures that should be applied in all patient care situations. This includes the use of gloves, masks, and gowns when necessary, as well as maintaining a clean and sanitary environment.

The Importance of Infection Prevention

Infections can have serious consequences, particularly in vulnerable populations such as children, the elderly, and individuals with weakened immune systems. The spread of infectious diseases can also have significant social and economic impacts, including disruptions to healthcare systems and loss of productivity.

By implementing effective infection prevention and control measures, healthcare facilities can reduce the occurrence of healthcare-associated infections, improve patient outcomes, and promote a safe and healthy environment for both patients and healthcare workers.

WHO Guidelines for Infection Prevention and Control

The WHO has developed comprehensive guidelines and recommendations for infection prevention and control in various healthcare settings, including hospitals, long-term care facilities, and community healthcare settings. These guidelines address a wide range of topics, including hand hygiene, isolation precautions, environmental cleaning, and management of outbreaks.

The guidelines emphasize the importance of a multidisciplinary approach to infection prevention and control, involving healthcare workers, policymakers, and the community. They also highlight the need for continuous education and training, as well as the regular monitoring and evaluation of infection prevention practices.

By following the WHO guidelines for infection prevention and control, healthcare facilities can enhance their ability to prevent and control the spread of infectious diseases, protect their patients and staff, and contribute to global efforts to reduce the burden of infections.

Question and answer:

What is the definition of infection?

Infection is defined as the invasion and multiplication of microorganisms in body tissues, which can lead to disease or illness.

How does WHO define infection?

According to the World Health Organization (WHO), infection is defined as the entry and multiplication of microorganisms in the body, resulting in a localized or systemic reaction.

Can you provide a specific definition of infection?

Sure, a specific definition of infection according to WHO is the invasion of the body by pathogenic microorganisms, their multiplication, and the reaction of host tissues to these microorganisms and the toxins they produce.

What are the key components of the definition of infection?

The key components in the definition of infection are the invasion of pathogenic microorganisms, their multiplication within the body, and the reaction of the host tissues to these microorganisms and the toxins they release.

Why is it important to have a clear definition of infection?

Having a clear definition of infection is important for the proper diagnosis, treatment, and prevention of infectious diseases. It allows healthcare professionals to identify and understand the nature of the infection, which in turn helps in the development of effective strategies to control its spread.

What is the definition of infection according to the World Health Organization?

According to the World Health Organization (WHO), an infection is defined as the invasion and multiplication of pathogenic microorganisms in the human body, leading to various clinical manifestations and potentially causing illness or disease.