Pneumonia is caused by several different organisms, including bacteria, viruses, and fungi. While any individual may develop the condition, it is most serious for infants and young children, individuals over the age of 65, and people with underlying health conditions or weakened immune systems. ...
The causative microorganisms for CAP and HAP differ substantially. The most common causal microorganisms in CAP areStreptococcus pneumoniae, respiratory viruses,Haemophilus influenzaeand other bacteria such asMycoplasma pneumoniaeandLegionella pneumophila. Conversely, the most frequent microorganisms in HAP areSta...