Indirect Haemaglutination test is a reliable quantitative serological test for measuring antibodies against angara disease. The etiological agent contained in the liver of affected chick did not directly haemaglutinate erythrocyte of chickens. The antibody titre measured through IHA varied from 1:8-1: 128, in the sera (samples) of experimentally infected chickens at days 7, 14 and 21 post vaccination.
Key words: Haemagglutination, titre, sera, angara disease.
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