“…Common etiologic agents include Mycoplasma pneumoniae, viruses such as influenza viruses A and B, parainfluenza viruses, respiratory syncytial virus, adenoviruses, rhinoviruses, varicella-zoster virus, Chlamydia spp., Coxiella burnetii, and P. carinii (Kobzik & Schoen, 1994;Winn & Chandler, 1994;Winn & Walker, 1994).…”