HPAI in Yun-Lin; LPAI in T'ai-Chung15 May 2012
TAIWAN - The Taiwanese veterinary authorities have reported one outbreak of highly pathogenic avian influenza in Yun Lin and one outbreak of low pathogenic avian influenza in T'ai-Chung.
The World Organisation for Animal Health (OIE) received Follow-up Report No. 4 and Follow-up Report No. 7 on 14 May reporting HPAI in native chickens and LPAI in ducks respectively.
Out of 15461 chickens, 6500 cases were identified and 3850 deaths were reported. 11611 chickens were destroyed.
Clinical cases were notified by the veterinarian and abnormal mortality rate was noticed. The local disease control center (LDCC) conducted movement restrictions, clinical inspection, epidemiological investigation and sampling on the farm.
The results of RT-PCR test and HA0 cleavage site sequencing are considered as H5N2 HPAI. Clinical and epidemiological investigation of surrounding poultry farms was conducted. No other case or evidence of infection was detected.
In the case of ducks, 176 showed signs of susceptibility out of which 20 cases were identified. No deaths were reported and no birds were destroyed.
Nucleic acids of the notifiable avian influenza (NAI) virus were detected on a duck farm during active surveillance by RT-PCR test. Movement restriction was implemented on the infected farm. The ducks were normal without clinical signs.
The result of virus isolation was negative and HA0 cleavage site sequencing test demonstrated H5N2 subtype of LPAI. Clinical and epidemiological investigation of surrounding poultry farms was conducted. No other case or evidence of infection was detected.
The source of both outbreaks remain inconclusive.
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