Antibiotics are only helpful if you also have a bacterial infection.

抗生素只有在你受到细菌感染时才起作用。

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Not only have they found a specific genetic signature that indicates viral infection, but the team has concluded that viruses and bacterial infections trigger different genes.

他们的团队不仅发现了标志病毒感染的特殊基因信号，而且得出了病毒和细菌感染能够触发其他基因变化的结论。

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In the past, explanations have concentrated on environmental factors such as the smoking habits of the parents, bacterial infection and (most famously) a baby's sleeping position.

过去人们将病因归咎于环境因素，如父母的抽烟习惯，细菌感染以及婴儿的胎位(这是最为著名的说法)。

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One can have skin reactions and rashes due to a reaction to bacterial, viral or fungal infection or an allergic reaction to medicines used to treat it.

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This experiment does, however, suggest that genetics alone may explain some cases of SIDS. In the past, explanations have concentrated on environmental factors such as the smoking habits of the parents, bacterial infection and (most famously) a baby's sleeping position.

ECONOMIST: Sudden infant death syndrome