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Há 17 horas · Should a day come when the bird flu adapts and gains the ability to transmit efficiently from animals to humans; and then from humans to humans – that would be the beginnings of a pandemic, said ...
Há 17 horas · Should a day come when the bird flu adapts and gains the ability to transmit efficiently from animals to humans; and then from humans to humans – that would be the beginnings of a pandemic, said ...