Ten ducks were inoculated with H5N1 virus and were sampled before inoculation and at 8, 15, 22, 29 and 34 days post inoculation. HI titers are expressed as thelog2 value of the reciprocal of the highest dilution causing inhibition of haemagglutination. The lowest detectable antibody titre was 2 log2; thus, any sera withtitres below this were classified as<2 log2. HI titres of =4 log2 were classified as positive. Abbreviations: HI-CRBC (Haemagglutination inhibition test using chickenred blood cells), HI-HRBC (Haemagglutination inhibition test using horse red blood cells), N (number).
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