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            Pneumococcal Disease | Influenza (Flu) | Coronavirus Disease 2019 (COVID-19) | Mycoplasma pneumoniae Infection | Respiratory Syncytial Virus (RSV)
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October 7, 2024
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  About Pneumonia
          Key points
            * Bacteria and viruses are common causes of pneumonia (a lung infection).
            * Fungi and parasites are less common causes.
            * Germs that commonly cause pneumonia in the community are different from those in healthcare settings.
            * Clinicians aren't always able to find out which germ caused someone to get sick with pneumonia.
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        Overview
        Pneumonia is an infection of the lungs. Many germs (bacteria, fungi, parasites, and viruses) can cause pneumonia.
          World Pneumonia Day is November 12, 2024.
          World Pneumonia Day is November 12, 2025
        Types
        People in the community and people in healthcare settings may be exposed to different types of bacteria and viruses.
        Defining types of pneumonia
        Community-acquired pneumonia is when someone develops pneumonia in the community (not in a hospital).
        Healthcare-acquired pneumonia is when someone develops pneumonia during or following a stay in a healthcare setting.
        Ventilator-associated pneumonia is when someone gets pneumonia after being on a ventilator, a machine that supports breathing.
        Symptoms
        Common symptoms of pneumonia include:
          * Chest pain when breathing or coughing
          * Altered mental status (confusion)
          * Cough
          * Fatigue (feeling tired)
          * Fever or chills
          * Nausea, vomiting, or diarrhea
          * Shortness of breath
        Who is at risk
        Some people are at increased risk for pneumonia due to age, other health conditions, and certain behaviors.
          Keep Reading: Risk Factors
        Causes
        Bacterial infections
        Bacterial infections that are common causes of community-acquired pneumonia include:
          * Mycoplasma pneumoniae infection
          * Pneumococcal disease
        The following bacterial infections can cause pneumonia, but are less common causes:
          * Chlamydia pneumoniae infection
          * Haemophilus influenzae disease
          * Legionella infection (Legionnaires' disease and Pontiac Fever)
          * Pertussis (whooping cough)
          * Psittacosis
        Fungal infections
        In general, fungal infections are a less common cause of pneumonia.
          Keep Reading: Fungal Diseases
        Viral infections
        Viral infections that commonly cause pneumonia include
          * COVID-19
          * Human metapneumovirus (HMPV) infection
          * Human parainfluenza virus (HPIV) infection
          * Influenza (flu)
          * Respiratory syncytial virus (RSV) infection
          * Rhinovirus infection
        The following viral infections can cause pneumonia, but are a less common cause:
          * Adenovirus infection
          * Chickenpox
          * Measles
          Sometimes the cause of pneumonia is unknown‎‎
          Sometimes the cause of pneumonia is unknown‎
              Healthcare providers are not always able to find out which germ caused someone to get sick with pneumonia.
        Prevention
        Pneumonia affects millions of people worldwide each year.
        People can lower their risk of pneumonia with immunizations and other healthy living practices.
          Keep Reading: Prevention and Control
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        Healthcare-associated infections
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  October 7, 2024
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    Pneumonia
    Pneumonia is a lung infection that can be caused by many germs. Treatment and prevention options and who's at risk vary by cause.
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