Some people catch pneumonia during a hospital stay for another illness. Coronavirus 2019 (COVID-19) may cause pneumonia, which can become severe. But in some cases it can become very serious. Viruses are the most common cause of pneumonia in children younger than 5 years. Some of the viruses that cause colds and the flu can cause pneumonia. The fungi that cause it can be found in soil or bird droppings and vary depending upon geographic location. This type of pneumonia is most common in people with chronic health problems or weakened immune systems, and in people who have inhaled large doses of the organisms. Walking pneumonia is an informal name given to this type of pneumonia, which typically isn't severe enough to require bed rest. It typically produces milder symptoms than do other types of pneumonia. Mycoplasma pneumoniae also can cause pneumonia. It may affect one part (lobe) of the lung, a condition called lobar pneumonia. This type of pneumonia can occur on its own or after you've had a cold or the flu. The most common cause of bacterial pneumonia in the U.S. It occurs outside of hospitals or other health care facilities. Community-acquired pneumoniaĬommunity-acquired pneumonia is the most common type of pneumonia. Pneumonia is classified according to the types of germs that cause it and where you got the infection. But sometimes these germs can overpower your immune system, even if your health is generally good. Your body usually prevents these germs from infecting your lungs. The most common are bacteria and viruses in the air we breathe.
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