Virus titers and serum titers were calculated by the method of Reed and Muench. In the hemagglutination-inhibition test, monkey-kidney tissue-culture fluid was used as antigen for the viruses ...
Immunogenicity was assessed by hemagglutination-inhibition (HI ... alternate-lineage B strain were based on HI geometric mean titers (pooled analyses of primed and half of unprimed cohort with ...