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  • Title: An antigenic variant of the Hong Kong-68 influenza A 2 virus.
    Author: Pereira MS, Schild GC.
    Journal: J Hyg (Lond); 1971 Mar; 69(1):99-103. PubMed ID: 5291756.
    Abstract:
    Both the haemagglutinin and the neuraminidase of influenza A2 virus have undergone progressive antigenic drift since this subtype first appeared in 1957.In 1968 a strain showing a much greater antigenic difference was isolated in Hong Kong. This variant has been responsible for epidemics throughout the world in the past 2 years.In the second year of its prevalence a small proportion of strains isolated showed a small but definite antigenic change, related principally to the haemagglutinin component.This new variant formed about 4% of all strains investigated and was detected in Britain, Portugal, France and New Zealand.
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