| Summary: | Abstract The first report of Aelurostrongylus falciformis ( Schlegel 1933 ) in Fennoscandian badgers is described. Routine parasitological examination of nine Norwegian badgers, at the National Veterinary Institute during 2004 and 2005, identified A . falciformis in the terminal airways of five of the animals. The first stage larvae (L1) closely resembled, in size and morphology, those of Angiostrongylus vasorum ( Baillet 1866 ). The diagnosis for both A . falciformis and A . vasorum is frequently based on the identification of L1 in faeces or sputum. The potential for misclassification of an A . falciformis infection as A . vasorum , where larval identification is the only diagnostic method used, is discussed.
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