虽然最有效的治疗方法是长期使用联合药物，但单剂量的治疗也能减少一半的感染几率。
Although the most effective treatment involves a combination of drugs taken over a long period, even a single dose of treatment can cut the transmission rate by half.
使用另一种药物nevirapine，即使单剂量就能将患病母亲传染婴儿的危险降低一半，更长的疗程可以将危险降低90%。
Even a single dose of another drug, nevirapine, halves the risk of an infected mother passing the virus to her baby. More extensive courses can reduce the risk by 90%.
一些专家指出，大概有一半的药物，目前其使用的剂量和服用的频率都是错误的。
Some experts suggestthatperhaps half of all medicines are taken at the wrong dose and frequency.
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