Fish with clinical signs similar to that of epizootic ulcerative syndrome were found in various locations within the Chobe-Zambezi river system in December 2006. The fish showed haemorrhagic dermatitis and the lesions were covered with fungal-like mycelia. This outbreak was previously reported to the OIE on 7 March 2007 as haemorrhagic septicaemia. Samples of various fish species were tested at Botswana National Veterinary Laboratory (BNVL) and Aeromonas hydrophila was isolated. Further investigations were conducted by FAO experts, Inland Aquatic Animal Health Research Institute (AAHRI) and the Network of Aquaculture Centres in Asia-Pacific (NACA) during May 2007. AAHRI (the OIE Reference Laboratory for EUS) confirmed the disease by histological examination.
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