2019 年：美国首例人类感染猪流感 (H1N2) 病例，患者为宾夕法尼亚州儿童，在与猪接触后康复。 2019: First US human case of swine flu (H1N2) in PA child, recovered after pig contact.

宾夕法尼亚州儿童成为美国 2019 年首例人类感染猪流感 (H1N2) 病例。 Pennsylvania child becomes first human case of swine flu (H1N2) in the US in 2019. 这名最近接触过猪的孩子现已康复。 The child, who had recent contact with pigs, has since recovered. 该毒株是一种新型甲型流感病毒，是一种新发现的 H1N2 亚型，经常感染猪。 The strain, a novel influenza A virus, is a newly identified subtype of H1N2 that regularly infects pigs. 疾病预防控制中心报告说，像这样的变异流感病毒经常发生在最近接触过受感染猪的人身上，并且通常不会轻易或持续地在人与人之间传播。 The CDC reports that variant influenza viruses like this one often occur in people with recent exposure to infected pigs and usually do not spread easily or sustainably from person to person.