What causes pneumonia?
The majority of cases of pneumonia are caused by the bacteria Streptococcus pneumoniae. However, different types of bacteria, viruses, and fungi can cause pneumonia. Other common types of bacteria that can cause pneumonia include:
Viral pneumonia can be caused by influenza (flu) virus or many other types of respiratory viruses. Most cases are mild and only last a short time, but the influenza virus can cause serious, sometimes fatal cases of pneumonia.
Pneumonia can also be caused by some types of fungi, most often Pneumocystis jirovecii, Aspergillus species, and Cryptococcus neoformans. Pneumocystis jirovecii used to be called Pneumocystis carini or PCP pneumonia and most often occurs in people with HIV, cancer, and post-transplant patients. Fungal infections are usually treated with antifungals once the cultures are confirmed.
Next: Signs And Symptoms Of Pneumonia