The danger, she said, is that swine flu could mix with other flu strains, such as H5N1 bird flu, and become far more lethal.

她表示现在面临的危险是，猪流感病毒可能和包括H5N1禽流感病毒在内的其他流感病毒组合，变得更加致命。

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"They said that what we had here was an atypical flu, but if the boy tested positive for swine flu, where did he get it from?" she said.

他们说我们这里是典型的流感，但既然这孩子猪流感呈阳性，那么他的病是从哪来的呢？

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She ordered tests for other hospital patients with swine flu and the pattern was confirmed: the sicker they were, the lower their IgG2 levels.

她开始对医院里其他的猪流感患者进行检测，出来的结果证实了她的猜测：病情越重的人，他们的IgG2的水平越低。

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She added that, for the majority of people, swine flu was a "mild, self-limiting, often unpleasant infection but nonetheless the vast majority recover".

BBC: New mothers urged to get swine flu vaccine