1Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, University of Urmia, Urmia, Iran
2Department of Pathobiology, Faculty of Veterinary Medicine, University of Urmia, Urmia, Iran
3Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Urmia, Urmia, Iran
4Graduated from School of Veterinary Medicine, Islamic Azad University of Urmia, Urmia, Iran
871 mesenteric lymph nodes taken from 110 native cattle from Urmia slaughter-house with different ages were examined for Linguatula serrata infection. The lymph nodes were studied based on their colour and consistency. 44% of the cattle were found positive for L. serrata infection. The number of parasites isolated from each infected lymph node varied from 1 to 69 with a mean of 5.48. There were no significant differences in the number of parasites in different age groups. The study underlined the need for a more thorough investigation of mesenteric lymph nodes inspection in the cattle of this region.