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  • Title: Serological response of chickens either vaccinated or artificially infected with Haemophilus paragallinarum.
    Author: Yamaguchi T, Iritani Y, Hayashi Y.
    Journal: Avian Dis; 1988; 32(2):308-12. PubMed ID: 3401174.
    Abstract:
    The serological response of chickens either vaccinated or artificially infected with Haemophilus paragallinarum (Hpg) serovar A or C was investigated using both a specific hemagglutinin (HA) antigen and a common HA antigen. With Hpg serovar A, both vaccinated and artificially infected chickens produced hemagglutination-inhibition (HI) antibodies to Hpg serovar-specific and Hpg common HA antigens. Most chickens vaccinated with Hpg serovar C had detectable HI antibodies to both types of HA antigen by 3 weeks postvaccination, after which titers gradually declined. In contrast, most chickens artificially infected with serovar C produced HI antibodies to only the common HA antigen; very few of these chickens produced HI antibodies to the serovar-specific HA antigen.
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