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  • Title: Antigenic variation of equine (Heq2Neq2) influenzavirus.
    Author: Pereira HG, Takimoto S, Piegas NS, do Valle LA.
    Journal: Bull World Health Organ; 1972; 47(4):465-9. PubMed ID: 4540996.
    Abstract:
    Influenza equine (Heq2Neq2) strains isolated during the course of epizootics observed in Guanabara (Rio de Janeiro) and São Paulo, Brazil, in July-October 1969 were shown to differ antigenically from earlier strains of the same subtype (A/equine/Miami/1/63 (Heq2Neq2)). The difference could be clearly demonstrated in haemagglutination inhibition tests performed with postinfection horse or ferret sera but not with hyperimmune rooster sera. Antibody responses of diseased horses were higher and more frequent against current isolates than against strain equine/Miami/1/63. Some animals also showed antibody responses to the Hong Kong variant of human influenzavirus A.
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