然而，这一点对于那些每天都坐公汽或有轨电车的人并不适用——也i许是因为他们逐渐建立起了免疫系统。
However, this did not hold true for those who used buses or trams every day - perhaps because they had built up immunity over time.
由有症状的艾滋病毒/艾滋病或其他病因导致的严重免疫缺陷或有胸腺疾患的人。
people with severe immunodeficiency due to symptomatic HIV/AIDS or other causes, or in the presence of a thymus disorder.
由有症状的艾滋病毒/艾滋病或其他病因导致的严重免疫缺陷或有胸腺疾患的人。
people with severe immunodeficiency due to symptomatic HIV/AIDS or other causes, or in the presence of a thymus disorder.
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