Abstract:
:We investigated episodes of suspected highly pathogenic avian influenza (HPAI)-like illness among 12 meat duck flocks in two districts in Tien Giang province (Mekong Delta, Vietnam) in November 2013. In total, duck samples from 8 of 12 farms tested positive for HPAI virus subtype A/haemagglutinin 5 and neuraminidase 1 (H5N1) by real-time RT-PCR. Sequencing results confirmed clade of 2.3.2.1.c as the cause of the outbreaks. Most (7/8) laboratory-confirmed positive flocks had been vaccinated with inactivated HPAI H5N1 clade 2.3.4 vaccines <6 days prior to onset of clinical signs. A review of vaccination data in relation to estimated production in the area suggested that vaccination efforts were biased towards larger flocks and that vaccination coverage was low [21.2% ducks vaccinated with two shots (range by district 7.4-34.9%)]. The low-coverage data, the experimental evidence of lack of cross-protection conferred by the currently used vaccines based on clade 2.3.4 together with the short lifespan of meat duck flocks (60-70 days), suggest that vaccination is not likely to be effective as a tool for control of H5N1 infection in meat duck flocks in the area.
journal_name
Transbound Emerg Disjournal_title
Transboundary and emerging diseasesauthors
Cuong NV,Truc VN,Nhung NT,Thanh TT,Chieu TT,Hieu TQ,Men NT,Mai HH,Chi HT,Boni MF,van Doorn HR,Thwaites GE,Carrique-Mas JJ,Hoa NTdoi
10.1111/tbed.12470subject
Has Abstractpub_date
2016-04-01 00:00:00pages
127-35issue
2eissn
1865-1674issn
1865-1682journal_volume
63pub_type
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