这些药物抑制一种叫做神经氨酸酐酶的酶，这种酶可以促使新生成的病毒离开被感染的细胞向周身散播。
These drugs act against an enzyme called neuraminidase, which allows newly formed viruses to leave infected cells and spread around the body.
专家们认为这样的作用并不理想，因为存在已免疫的鸡携带与散播病毒的风险，虽然它们看上去很健康。
However, experts are divided over its usefulness, because there is the risk that vaccinated chickens might still harbour and shed the virus, while appearing to be healthy.
病毒可从这里经苍蝇散播他处。
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