Map of Iran showing the six provinces (Gilan, 1; Mazandaran, 2; Khuzestan, 3; Isfahan, 4; Khorasan-e-Razavi, 5; and Ardabil, 6) where Trichinella spp. infected animals have been detected from 1967 to the present study. Khorasan-e-Razavi province, where the present study was carried out, is marked in green. In this province, animals tested for Trichinella spp. were collected from Mashhad, Sabzevar and Neyshabur cities. Trichinella britovi-positive animals were detected in the surroundings of Mashhad and Sabzevar cities. Teheran province is marked in grey. The five provinces marked in yellow show literature data. Each symbol of Trichinella spp.-infected animals represents from 1 to more than 100 positive heads: brown bear, open star; golden jackal, open circle; jungle cat, open hexagon; leopard, black hexagon; mongoose, open triangle; Persian gerbil, black star; red fox, open square; stripped hyena, black circle; stray dog, black triangle; wild boar, black square.