Serological and epidemiological studies on primary atypical pneumonia and related acute upper respiratory disease.
D016021:Epidemiologic Studies; D006801:Humans; D007251:Influenza, Human; D009175:Mycoplasma Infections; D011014:Pneumonia; D011019:Pneumonia, Mycoplasma; D012137:Respiratory System; D012140:Respiratory Tract Diseases
PNEUMONIA/atypical; RESPIRATORY TRACT/diseases