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综合香港媒体报导,何栢良指出,和港大微生物学系讲座教授袁国勇一起分析发现,前23宗个案鼻液和唾液的含病毒量在入院首日最高,但即使过了14天再次检验,病毒含量仍然非常高,到了入院21日病毒量也不低。何栢良也从患者的鼻液样本中发现「每1毫升有1亿个病毒」,相当於芝麻般大小的份量已有10万个病毒,所以没有抗体的大众,可能只需几株病毒就容易被感染。