Influenza strains circulating among swine populations can cause outbreaks in humans. In October 2020, we detected a variant influenza A subtype H1N2 of swine origin in a person in Alberta, Canada. We initiated a public health, veterinary, and laboratory investigation to identify the source of the infection and determine whether it had spread. We identified the probable source as a local pig farm where a household contact of the index patient worked. Phylogenetic analysis revealed that the isolate closely resembled strains found at that farm in 2017. Retrospective and prospective surveillance using molecular testing did not identify any secondary cases among 1,532 persons tested in the surrounding area. Quick collaboration between human and veterinary public health practitioners in this case enabled a rapid response to a potential outbreak.

在猪群中传播的流感病毒株可能会导致人类爆发流感。 2020 年 10 月，我们在加拿大艾伯塔省的一个人身上检测到了猪源性甲型 H1N2 流感病毒亚型。我们启动了公共卫生、兽医和实验室调查，以查明感染源并确定其是否已传播。我们确定了可能的来源是当地一家养猪场，指示患者的家庭接触者在该养猪场工作。系统发育分析显示，该分离株与 2017 年在该农场发现的菌株非常相似。使用分子检测进行的回顾性和前瞻性监测并未在周边地区接受检测的 1,532 人中发现任何继发病例。在这种情况下，人类和兽医公共卫生从业者之间的快速合作能够对潜在的疫情爆发做出快速反应。