RESUMEN
<p><b>OBJECTIVE</b>To evaluate the prevalence of nymphal stages of L. serrata in mesenteric lymph nodes of camels slaughtered in Mashhad slaughterhouse, Northeast of Iran.</p><p><b>METHODS</b>For this purpose, mesenteric lymph nodes of 400 camels of different sex and age were examined. The lymph nodes were examined macroscopically and a digestion method was also applied for investigation of samples which was negative macroscopically.</p><p><b>RESULTS</b>The mesenteric lymph nodes of 73 camels out of 400 (18.25%) were infected by L. serrata nymphs.</p><p><b>CONCLUSIONS</b>Prevalence of L. serrata nymphs in males and females and different age was not significantly different (P>0.05), but difference was observed between the prevalence in different seasons (P< 0.05). The potential importance of these findings to human health is discussed. This is the first report of infection with L. serrate of camels in camels slaughtered at northeast of Iran.</p>