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Acta Pathologica Et Microbiologica Scandinavica. Section B, Microbiology|December 1, 1976
Antibodies to influenza A/swine-like viruses (Hsw1N1) in human sera: antigenic stimulation and changes in antibody statusR PyhäläThe Journal of Hygiene|October 1, 1985
Antibody status to influenza A/Singapore/1/57(H2N2) in Finland during a period of outbreaks caused by H3N2 and H1N1 subtype virusesR PyhäläThe Journal of Hygiene|April 1, 1980
Protection by a polyvalent influenza vaccine and persistence of homologous and heterologous HI antibodies during a period of two epidemic seasonsR PyhäläMedical Biology|December 1, 1976
NDV-O agglutinins and heteroagglutinins in sera of blood donorsR PyhäläClinical and Experimental Immunology|September 1, 1975
Studies on the specificity of agglutinins against human erythrocytes modified by Newcastle disease virusR Pyhälä, K AhoThe Journal of Hygiene|February 1, 1979
Influenza A(H1N1) viruses of the 1977/78 outbreak: isolation and haemagglutination propertiesR Pyhälä, R VisakorpiInternational Journal of Epidemiology|June 1, 1975
Serum HI antibody and protection against influenza: a follow-up survey at community level of three epidemics caused by different H3N2-variantsR Pyhälä, K AhoJournal of Virological Methods|March 1, 1987
Antigenic analysis of intraepidemic variants of influenza A (H3N2) viruses by hyperimmune rat antiseraR Pyhälä, L PyhäläActa Virologica|February 1, 1976
The value of complement fixation and haemagglutination inhibition tests in the diagnosis of influenza AR Pyhälä, M KleemolaThe Journal of Hygiene|February 1, 1981
Seroepidemiology of H1N1 influenza: the infection and re-infection rate in winter 1978-79R Pyhälä, K AhoPageof 6