Several mortality events involving barn swallows (Hirundo rustica) and cliff swallows (Petrochelidon pyrrhonota) were reported in the Upper Midwestern states in 2017 and 2018. Barn swallow mortality followed unseasonal cold snaps, with the primary cause of death being emaciation with concurrent air sac nematodiasis. Lesions in cliff swallows were consistent with blunt force trauma from suspected car impacts. Examination of air sac nematodes from both bird species revealed morphological characters consistent with Diplotriaena obtusa. Sequence analysis of the partial 18S rRNA gene indicated the samples clustered with other species in the genus Diplotriaena. These nematodes provide a link between morphological specimens and DNA sequence data for D. obtusa.

2017 年和 2018 年，中西部各州报告了几起涉及家燕( Hirundo rustica ) 和悬崖燕子 ( Petrochelidon pyrrhonota ) 的死亡事件。家燕死亡发生在非季节性寒流之后，主要死因是消瘦并发气囊线虫病. 悬崖燕子的损伤与疑似汽车撞击造成的钝器损伤一致。对来自两种鸟类的气囊线虫的检查揭示了与Diplotriaena obtusa一致的形态特征。部分18S rRNA 基因的序列分析表明样品与Diplotriaena属中的其他物种聚集在一起. 这些线虫在形态学标本和D. obtusa 的DNA 序列数据之间提供了联系。