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  1. Pneumonia - Symptoms and causes - Mayo Clinic

    Jun 13, 2020 · Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, …

  2. Pneumonia: Causes, Symptoms, Diagnosis & Treatment

    Nov 15, 2022 · Pneumonia is a lung infection caused by bacteria, viruses or fungi. Fluid and inflammation in your lungs makes breathing hard and causes fever and other symptoms.

  3. What Causes Pneumonia? - American Lung Association

    Pneumonia can be caused by a wide variety of bacteria, viruses and fungi in the air we breathe. Identifying the cause of your pneumonia can be an important step in getting the proper …

  4. How Do You Get Pneumonia? A Look at Causes and Risk

    Dec 5, 2024 · Learn about pneumonia, including common causes and risk factors, who’s most susceptible to getting it, and ways to prevent the spread.

  5. Pneumonia: Symptoms, Causes, and Treatment - Harvard Health

    Jun 24, 2024 · Most cases of pneumonia are caused by bacteria or viruses, but pneumonia can also be caused by fungi. The symptoms of pneumonia can range from mild to severe, and …

  6. Pneumonia Causes and Risk Factors - NHLBI, NIH

    Mar 24, 2022 · Viruses that infect your lungs and airways can cause pneumonia. The flu (influenza virus) and the common cold (rhinovirus) are the most common causes of viral …

  7. About Pneumonia | Pneumonia | CDC

    Oct 7, 2024 · Many germs (bacteria, fungi, parasites, and viruses) can cause pneumonia. People in the community and people in healthcare settings may be exposed to different types of …