暴露后的抗生素治疗与疫苗接种相结合可预防再感染。
Protection against rechallenge was provided by combining postexposure antibiotic treatment with vaccination.
默克公司的疫苗临床试验研究了五年，葛兰素公司研究了将近六年半，因此还不是很清楚疫苗的保护时间能维持多久。
Merck's vaccine was studied in clinical trials for five years, and Glaxo's for nearly six and a half, so it is not clear how long the protection will last.
默克和葛兰素的发言人说所有证据表明疫苗是安全有效的。 没有证据表明需要再加强注射一针。
Spokesmen for Merck and Glaxo say all indications are that their vaccines are safe and effective, and there is no evidence that a booster shot will be needed.
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