Table 6

Matrix indicating the number and percentage of log antibody titers obtained in two HI tests in ducks naturally exposed to H5 avian influenza virus
HI HRBC log titres
HI CRBC log titres <2 2 3 4 5 6 7 8 N Total (%)
<2 469 0 5 5 1 0 0 0 485 (93.6)
2 1 1 1 2 0 0 0 0 8 (1.5)
3 0 0 0 7 5 0 1 0 14 (2.7)
4 0 0 0 4 4 1 0 0 9 (1.7)
5 0 0 0 0 0 1 0 0 1 (0.2)
6 0 0 0 0 0 1 0 0 1 (0.2)
7 0 0 0 0 0 0 0 0 0 (0.0)
8 0 0 0 0 0 0 0 0 0 (0.0)
N Total (%) 470 (90.7) 1 (0.2) 6 (1.2) 9 (1.7) 18 (3.5) 10 (1.9) 3 (0.6) 1 (0.2) 518

Ducks were sampled in December 2008 in Central Java, Indonesia. A/chicken/Legok/2003(H5N1) antigen was used in both tests. HI titers are expressed as the log2 value of the reciprocal of the highest dilution causing inhibition of haemagglutination. The lowest detectable antibody titre was 2 log2; thus, any sera with titres below this were classified as < 2 log2. Abbreviations: HI-CRBC (Haemagglutination inhibition test using chicken red blood cells), HI-HRBC (Haemagglutination inhibition test using horse red blood cells), N (Number).

Wibawa et al.

Wibawa et al. BMC Veterinary Research 2012 8:117   doi:10.1186/1746-6148-8-117

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