换句话说，就像斗牛士的斗篷一样，血凝素的头部将免疫攻击的目标从病毒相对更脆弱的地方转移开。

Like a bullfighter's cape, in other words, the heads of haemagglutinin deflect the immune attack away from more vulnerable parts of the virus.

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“血凝素是一个诱饵”，波士顿哈佛医学院的免疫学家韦恩·马拉斯科说，“这些球状头部可以有很多变异还不对病毒产生不好的影响。”

"Haemagglutinin's a decoy," says Wayne Marasco, an immunologist at Harvard Medical School in Boston. "Those globular heads can undergo many mutations without the virus suffering any ill effects."

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基本的免疫原性滴定终点可以4倍或者更大的对在3种疫苗品系接种之前和接种后28天增加血清血凝素抑制剂抗体。

Primary immunogenicity end points were the rates of 4-fold or greater increases in serum hemagglutinin inhibition antibody to each of the 3 vaccine strains before and 28 days after inoculation.

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