Table 1.

Agents associated with atypical pneumonias

Agent	Pneumonia type
True bacteria
Legionella pneumophila	Mostly epidemics
Legionella spp.	Uncommon
Mycoplasma
Mycoplasma pneumoniae	Common
Rickettsia
Coxiella burnetti	Zoonosis
Chlamydia
Chlamydia pneumoniae	Common
Chlamydia psittaci	Uncommon
Chlamydia trachomatis	Infants
Viruses
influenza A and B	Common
adenoviruses 3, 4 and 7	Common
parainfluenzas	Common
respiratory syncytial	Common
rhinoviruses	Uncommon
enteroviruses	Uncommon
coronaviruses	Uncommon
herpes viruses	Uncommon