Fig. 1

The collection of the C. titillator. A-B The expelled larvae were found in the drinking fountain and feed trough; C-G The heads of slaughtered camel showing the presence of three stages of C. titillator larvae in the pharynx; C; E The detected third-stage larvae; D The detected first-stage larvae; F The detected first-stage and second-stage larvae; G A larva still adhered firmly to the nasopharyngeal mucosa with their two sharp black frontal hooks under pulled by forceps tip