[EFFECTIVENESS OF ANTI-INFLUENZA VACCINATION WITH LIVE VIRUS, TYPE A2. SERELOGICAL INVESTIGATIONS AND EPIDEMIOLOGICAL OBSERVATIONS].
D000486:Allergy and Immunology; D000906:Antibodies; D002690:Chlamydia Infections; D003168:Complement Fixation Tests; D004813:Epidemiology; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human; D012383:Romania; D014611:Vaccination
D000906:Antibodies; D007252:Influenza Vaccines
ANTIBODIES; COMPLEMENT FIXATION TESTS; EPIDEMIOLOGY; IMMUNOLOGY; INFLUENZA VACCINE; INFLUENZA, ASIAN; RUMANIA