[EPIDEMIOLOGIC INQUIRIES].
D003140:Communicable Disease Control; D016021:Epidemiologic Studies; D004813:Epidemiology; D006801:Humans; D008403:Mass Screening; D012698:Serologic Tests
COMMUNICABLE DISEASE CONTROL; EPIDEMIOLOGY; MASS SCREENING; SERODIAGNOSIS
SONDEOS EPIDEMIOL'OGICOS.