A captive garter snake (Thamnophis sirtalis) showed marked circumferential thickening of the body wall due to a chronic fibrous to necrotizing inflammatory reaction extending from the serosa to the skin. The lesions were associated with the presence of intra- and extracellular microsporidian organisms. With ultrastructural and molecular analyses the microsporidia were identified as Heterosporis anguillarum. This organism causes a morphologically similar disease in the Japanese eel (Anguilla japonica), but this is the first time it has been identified in an infected reptile.
Keywords: microsporidium; polymerase chain reaction; reptile; ultrastructure.
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