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武汉不明肺炎疫情持续，令不少港人人心惶惶，忧沙士重临。香港大学微生物学系讲座教授袁国勇相信，武汉不明原因肺炎由冠状病毒引起，他估计今次新病毒很大机会与沙士一样，源头来自蝙蝠，传给某种野生动物，再跳到人类。

袁国勇指，料新病毒不会很有效人传人，与病人非常紧密的接触者才有机会感染，又指若内地再多10至20宗个案，显示有可能病毒已在社区扩散。

袁国勇表示，下周尾是关键时间，由于1月2日关闭市场，病毒潜伏期约14日，如下星期尾仍有新增个案，即是病毒继续传播。不过，他说，内地仍然未说明病毒的来源，估计内地已掌握研究病毒的技术。