ERRATIC MIGRATION OF COCHLIOMYIA HOMINIVORAX LARVAE TO THE BRAIN OF A BOVINE

Abstract

Myiasis is a parasitic infection caused by dipteran larvae that affects both humans and animals. Cochliomyia hominivorax, one of the main species involved, causes obligate myiasis by developing exclusively in living tissue, generating severe lesions. This study reports an unusual case of erratic migration of larvae of this species to the brain of a bovine. During a technical visit, a crossbred Holstein calf, approximately four to seven months old, was examined in a weakened state and with multiple wounds on its limbs, aggravated by bird pecks. The animal was euthanized and sent for necropsy. Macroscopic analyses were performed and organ samples fixed in 10% formalin were collected. The findings revealed extensive myiasis in the right pelvic limb, with bone and muscle exposure. Surprisingly, similar larvae were identified in the region of the rostral colliculi of the brain, suggesting parasitic migration. This case highlights the severity of C. hominivorax infestation and reinforces the importance of appropriate management to avoid severe complications in cattle.