Avian Influenza Disease Emergency: issue No. 55 (25/08/2008)
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HPAI H5N1 pathogenicity (including clades 2.3.2 and 2.3.4 circulating in the Red River basin and presumably imported from China, as well as the clade 1 virus that has prevailed in he Mekong delta since early 2004) seems to be rising gradually. According to Mary Pantin-Jackwood if the US Department of Agriculture (USDA) in Athens, Georgia, and associated colleagues from the Viet Nam National Centre for Veterinary Diagnosis, this increase in pathogenicity translates into a more severe respiratory tract infection in ducks and an increase in cloacal virus titres.