Pneumonia is an infection of the lung tissue, caused by various bacterial species, virus, fungi or parasites. Thus it is not a single disease but a group of specific infections. Identification of the causative organism is the key to correct treatment. However, because of the serious nature of the infection experts on the subject suggest that antibiotic treatment should be started immediately before laboratory confirmation of the causative agent.

However below are known sources of the infection:

Community acquired pneumonia in Nigeria the commonest causative organisms are Streptococcus, Others are Haemophilus Influenza and Mycoplasma Pneumoniae
In children with measles or whooping cough or other viral epidemics staphylococcus aureus

is the most important agent.

Hospital acquired pneumonia, gram negative bacteria:
Pseudomonas aeruginanosa and staphylococcus aureus are the commonest.

Symptoms..More @.. Tips On Health