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.
莎拉身兼模特和主持人数职，是拉齐兰·默多克的妻子。
Sarah Murdoch, a fashion model and TV presenter, is married to Rupert Murdoch's son Lachlan.
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