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USDA conditionally approves H5N1 poultry vaccine

The US Department of Agriculture (USDA) has given a conditional approval to animal healthcare company Zoetis for an updated vaccine to protect poultry against the H5N1 bird flu strain. The Zoetis vaccine contains a killed version of an H5N2 variant that the company designed to work against currently circulating variants of the H5N1 virus.