Keywords: pneumonia etiology epidemiology

        Usually the main cause of death or after the most common cause of diarrhea in adults over the age of .30 pneumonia due to other pathogens including anaerobic bacteria. Streptococcus pneumoniae is the most common. ‘Staphylococcus aureus respiratory infections in developing countries’ Moraxella catarrhalis’ cocci ‘Haemophilus influenzae’ Chlamydia pneumoniae ‘Chlamydia psittaci’ Chlamydia trachomatis’ Legionella pneumophila ‘Klebsiella pneumoniae and other gram-negative bacilli. Mycoplasma pneumoniae is a bacteria-like microorganisms ‘is a common cause of older children and young people in particular’ is common in the spring. infants and children mainly pneumonia pathogens are viruses: respiratory syncytial virus’ adenovirus’ parainfluenza virus’ influenza A and influenza B viruses. these pathogens. but previously healthy adults’ only possible severe and widespread virus is influenza virus’ occasionally there varicella — zoster virus can cause adult pneumonia; other pathogens: more advanced bacterial ‘comprises the Novo card bacteria and actinomycetes; Mycobacterium ‘including Mycobacterium tuberculosis and atypical strains (mainly Mycobacterium kansasii and birds intracellular mycobacteria); fungi including the Histoplasma capsulatum’ crude Coccidioides bacteria cryptococcus neoformans ‘dermatitis blastomycosis’ ‘aspergillus fumigatus and diaphragm hairy mold and Pneumocystis carinii; Rickettsia’ main Bernat’s, Cox’s body (Q heat).