From: Surveillance of avian influenza virus type A in semi-scavenging ducks in Bangladesh
Winter season | Division | Wintering sites | Total no. of sample | No. of HA positive samples | No. of NDV positive samples | No. of AIV positive cases in NDV positive samples | RT-PCR positive samples of AIV | Prevalence of AIV (%) | Seasonal prevalence (%) |
---|---|---|---|---|---|---|---|---|---|
 | Sylhet | Hakaluki Haor | 450 | 278 | 126 | 19 (15.05)* | 146 | 32.44 | 26.89 |
Dec. 2009 to Feb. 2010 | Â | Tanguar Haor | 225 | 94 | 52 | 6 (11.54) | 51 | 22.67 | |
 | Dhaka | Jahangirnagar Lake | 225 | 73 | 37 | 4 (10.81) | 45 | 20.00 | |
 | Sylhet | Hakaluki Haor | 300 | 145 | 75 | 7 (9.33) | 63 | 21.00 | 18.50 |
Dec. 2010 to Feb. 2011 | Â | Tanguar Haor | 150 | 64 | 39 | 3 (7.69) | 27 | 18.00 | |
 | Dhaka | Jahangirnagar Lake | 150 | 58 | 23 | 2 (8.69) | 21 | 14.00 | |
 | Sylhet | Hakaluki Haor | 300 | 163 | 75 | 5 (6.67) | 58 | 19.33 | 18.33 |
Dec. 2011 to Feb. 2012 | Â | Tanguar Haor | 150 | 71 | 37 | 2 (5.41) | 23 | 15.33 | |
 | Dhaka | Jahangirnagar Lake | 150 | 73 | 41 | 2 (4.88) | 29 | 19.33 | |
Total | Â | Â | 2100 | 1019 | 505 | 50 (9.90%) | 463 | 22.05 | Â |