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华盛顿州大学流行病学副教授贝尔福德在分析美国首宗新冠肺炎确诊个案患者，以及后来感染者的病毒样本基因后推断，新冠肺炎在美国社区传播了至少6周，相信被感染的人数远比官方公布更多。

他在社交网发文指出，在比对华盛顿州斯诺霍米什县一名35岁男病人与同县一名青年病人的病毒样本基因后发现，病毒基因变异有相同之处，因此认为，较迟感染的那一名患者，其所感染的新型冠状病毒是来自较先感染的那一人。由于两名患者没有接触，因而推断病毒或已在美国社区传播了至少6周。

他说，两名病人分别于1月19日及2月28日确诊新冠肺炎，但两人从没接触，前者更是美国首宗确诊病例。

参与分析的法穆拉雷也表示，如果病毒或已在美国社区传播了6周，可能有150人至1500人受感染，而300人至500人是最可能的范围；这些人或已康复，或仍然染病。

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