33421Coliphages as ecological indicators of enteroviruses in various water systems*Journal articles · December 31, 1981
33422Weekly Epidemiological Record, 1981, vol. 56, 04 [full issue]Journal articles · December 31, 1981
33423Infected Areas as on 17 December 1981 = Zones Infectées an 17 décembre 1981Journal articles · December 31, 1981
33427INFLUENZA IN THE WORLD : Octobre 1979-Septembre 1980 = LA GRIPPE DANS LE MONDE : October 1979-September 1980Journal articles · December 31, 1981
33428Weekly Epidemiological Record, 1981, vol. 56, 09 [full issue]Journal articles · December 31, 1981
33430EXPANDED PROGRAMME ON IMMUNIZATION : Maintaining and Improving the Cold Chain = PROGRAMME ÉLARGI DE VACCINATION : Gestion et perfectionnement de la chaîne du froidJournal articles · December 31, 1981
33431The use of immuno-double-diffusion tests in epidemiological studies of influenza in SpainJournal articles · December 31, 1981
33435FIELD EPIDEMIOLOGY TRAINING PROGRAMME : Annual Report 1980-1981 = PROGRAMME DE FORMATION À L’ÉPIDÉMIOLOGIE SUR LE TERRAIN : Rapport annuel 1980-1981Journal articles · December 31, 1981
33436Characterization of antibodies to orthopoxviruses in human sera by radioimmunoassay*Journal articles · December 31, 1981
33437Field measurement of the effective dominance of an insecticide resistance in anopheline mosquitos*Journal articles · December 31, 1981
33438COMMUNICABLE DISEASE SURVEILLANCE DURING THE HAJ PILGRIMAGE = SURVEILLANCE DES MALADIES TRANSMISSIBLES PENDANT LE PÈLERINAGE À LA MECQUE (HADJ)Journal articles · December 31, 1981
33440VIRAL HEPATITIS SURVEILLANCE = SURVEILLANCE DE L’HÉPATITE VIRALEJournal articles · December 31, 1981