Some traditional prophylactic drugs are no longer effective because the parasites have become drug-resistant.

一些传统的预防药物已不再有效，因为这种寄生虫越来越有抗药性。

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Writing in PLoS Medicine's sister journal, PLoS ONE, Dr Abbas and Dr Mellors describe what happened when they added prophylactic anti-retroviral drugs to the model.

乌姆·阿巴斯博士与约翰·迈勒斯博士把投放预防性抗逆转录药物到疫情模型后所记录到情况发表在《公共科学图书馆之医学专刊》（PLoS Medicine's）的姐妹刊《第一公共科学图书馆》（PLoS ONE）上。

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Prophylactic use of veterinary drugs is prohibited.

禁止使用药物作预防疾病之用。

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These female-friendly technologies are vaginal microbicides and prophylactic drugs (though the latter would work for men, too).

ECONOMIST: Back to prevention

There are alternatives, such as bed nets and prophylactic drugs, but limitations of cost, user acceptance and infrastructure mean that they offer no easy fix.

ECONOMIST: Banning DDT is a great idea whose time has not yet come

Prophylactic drugs work by stopping it breeding after it gets in.

ECONOMIST: Back to prevention