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Volume 14, Number 12—December 2008

Dispatch

Avian Influenza Outbreaks in Chickens, Bangladesh

Paritosh K. BiswasComments to Author , Jens P. Christensen, Syed S.U. Ahmed, Himel Barua, Ashutosh Das, Mohammed H. Rahman, Mohammad Giasuddin, Abu S.M.A. Hannan, Mohammad A. Habib, Abdul Ahad, Abu S.M.S. Rahman, Rayhan Faruque, and Nitish C. Debnath
Author affiliations: Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh (P.K. Biswas, S.S.U. Ahmed, H. Barua, A. Das, M.H. Rahman, A. Ahad, R. Faruque, N.C. Debnath); Copenhagen University, Copenhagen, Denmark (J.P. Christensen); Bangladesh Livestock Research Institute, Dhaka, Bangladesh (M. Giasuddin); Department of Livestock Services, Dhaka (A.S.M.A. Hannan, M.A. Habib); Department of Livestock Services, Joypurhat, Bangladesh (A.S.M.S. Rahman);

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Table 1

Attack rates (infected upazila[s] for the infected districts) of avian influenza outbreaks in Bangladesh, 17/64 districts, January–July 2007

District No. farms, infected/total*
Attack rate (95% CI)†
Commercial Backyard Commercial Backyard
Dhaka 14/744 0/0 0.019 (0.027–0.009)
Dinajpur 0/29 1/124,872 0.000008 (0.000018–0.000002)
Gaibandha 1/69 0/52,950 0.014 (0.041–0.009) NA
Gazipur 3/1,956 0/0 0.001 (0.0032–0.0002) NA
Jamalpur 5/144 0/58,962 0.034 (0.063–0.005) NA
Jessore 2/298 3/331,295 0.006 (0.014–0.002) 0.000003 (0.000008–0.000002)
Joypurhat 0/124 1/101,152 NA 0.000009 (0.000027–0.00009)
Lalmonirhat 0/85 2/76,582 NA 0.00002 (0.00005–0.00001)
Magura 0/82 1/83,607 NA 0.00001 (0.00003–0.00001)
Naogaon 0/109 2/80,752 NA 0.00002 (0.00005–0.00001)
Narayangonj 7/925 0/0 0.007 (0.012–0.002) NA
Nilphamari 0/119 5/277,984 NA 0.00001 (0.00003–0.00001)
Noakhali 1/97 0/0 0.010 (0.029–0.009) NA
Rajbari 1/395 2/311,279 0.002 (0.006–0.002) 0.00006 (0.000014–0.000002)
Rangpur 0/95 2/143,263 NA 0.00001 (0.00003–0.00001)
Tangail 1/227 0/91,650 0.004 (0.012–0.004) NA
Thakurgaon
0/1,137
1/73,391


0.00001 (0.00003–0.00001)
Total 35/5,635 20/1,807,739 0.006 (0.008–0.004) 0.00001 (0.000014–0.000006)

*Infected, avian influenza–infected farms; total, farms in the infected upazila(s) of a district.
†CI, confidence interval; NA, not applicable.

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