title: [Study of the etiological structure of infrabacterial pneumonias in the town of Plovdiv during 1969-1971].
mesh_terms: D000818:Animals; D002031:Bulgaria; D004812:Epidemiologic Methods; D006801:Humans; D007251:Influenza, Human / Q000150:complications; D009175:Mycoplasma Infections / Q000453:epidemiology / Q000382:microbiology; D011002:Pleuropneumonia, Contagious / Q000453:epidemiology / Q000382:microbiology; D011014:Pneumonia / Q000453:epidemiology* / Q000209:etiology / Q000382:microbiology; D011022:Pneumonia, Rickettsial / Q000453:epidemiology / Q000382:microbiology
vernacular_title: Prouchvaniia vurkhu eiologichnata struktura na infrabakterialnite pnevmonii v gr. Plovdiv za 1969-1971 god