Many viruses and bacteria that cause pneumonia can already live in the nose or throat. Your immune system usually keeps you away from your lungs. However, your immune system can be weakened because it is already fighting another disease or due to some other factors like organ transplantation. In addition, immune power decreases with age. Therefore, the risk of pneumonia is higher if you are over 65 years.
Pneumonia is an infection that infects air sacs in one or both lungs. Airbags can become filled with fluid or pus (purulent substance) and cause cough with mucus or pus, fever, chills, and shortness of breath. Different organisms, including bacteria, viruses, and fungi, can cause pneumonia. Pneumonia can be serious and can range from mild to deadly. This situation is particularly serious for infants and young children, for people over 65, as well as for people with health problems or a weak immune system.