A new strain of H_5N_1 bird flu has emerged in China and is poised to start yet another global wave of infection. The human pandemic vaccines now being developed will not protect against it. Worse still, nearly three times as many Chinese poultry are infected with H_5N_1 now as last year, meaning there is a greater chance of human infections - despite China's insistence that all poultry be vaccinated against it. In fact, vaccination may be to blame for the new strain.
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