[primary atypical pneumonia] n (ca. 1944): any of a group of pneumonias (as Q fever and psittacosis) caused esp. by viruses, mycoplasmas, rickettsias, and chlamydias
PRIMARY ATYPICAL PNEUMONIA
Meaning of PRIMARY ATYPICAL PNEUMONIA in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012