🥩🦱🦂澳门手机123网站资料🔬🍔wǒ ràng wǒ de liǎng gè ér zi cóng xiǎo jiù yǒu dī tàn yì shí ， jiàn lì dī tàn sī wéi ， zǒu dī tàn zhī lù 。

Scientists believe that for the H5N1 virus to spread among humans, a mutation must occur in the protein spikes on its surface ...