Avian Influenza Disease Emergency: issue No. 17 (29/06/2004)
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Viet Nam: Ongoing surveillance for HPAI included the testing of over 10 000 poultry samples taken from various parts of the country. Results have shown that many were positive for H5 virus (27/06/04 Source: AFP, GPHIN). More information would be required regarding the presence or absence of clinical signs and type of test used for serology, virus isolation and pathological findings. Sound surveillance activities are of utmost importance to determine which areas would be appropriate for restockin g or to institute additional control measures. USA (H7N3): National Veterinary Services Laboratory (NVSL) confirmed that a flock of 14 birds in Hopkins County, Texas, was infected with H7N3 on 22/06/04. The farm is located some seven kilometres from the depopulated commercial operations that tested positive for the H7N3 strain of AI on routine blood tests in mid-May (The AI virus was not isolated in subsequent laboratory tests). This infected non-commercial flock had retested as negat ive over two weeks ago. Commercial or non-commercial flocks in the area are to be retested as part of an ongoing active surveillance programme. (23/06/04 Source: Texas Animal Health Commission NEWS RELEASE; FAO)