Oral Capillariosis Due to Eucoleus dispar in Migrating Sharp-shinned Hawks (Accipiter striatus) in New York, USA, 2016-18.

Oral lesions focused around the oral commissures were documented in several Sharp-shinned Hawks (Accipiter striatus) in the 2016-18 spring migration season at a banding station located on the southern shore of Lake Ontario, New York, US. Samples of the inflamed and caseous lesions repeatedly tested negative for Trichomonas gallinae and poxvirus; however, large numbers of capillariid eggs and embedded worms were consistently present. Morphologically, the nematodes were identified as Eucoleus dispar, which was confirmed by PCR and genetic sequencing. The affected hawks displayed no other clinical signs of illness, were in good body condition, and were released back into their migration pathway shortly after examination and testing. We report a unique clinical presentation for oral capillariosis in A. striatus.