Myiase nasale humaine àŒstrus ovis

Abstract

Summary : HUMAN NASAL MYIASIS DUE TO OESTRUS OVISOne case of human nasal myiasis caused by second and third instar larvae of Cestrus ovis was observed in Lille (North France). OEstrosis is a common myiasis of sheep and goats in Mediterranean and Tropical countries. The authors examine the oestrosis pathogenesis in the usual host (sheep) or in humans, and analyse the epidemiology, the symptomatology and the treatment of human cestrosis.KEY WORDS : autochthonous myiasis, OEstrus ovis, Diptera, human oestrosis. Résumé : Un cas de myiase nasale humaine due à des larves de stades L2 et L3 d'OEstrus ovis a été diagnostiqué à Lille (Nord de la France

Report of a Case of Human Nasal Myiasis Caused By Second Instar Larvae of Oestrus Ovis in CHU Oran: Review of Literature

“…They fall or are eliminated during sneezing on the soil, where they are transformed into a pupa, from which an adult insect is immersed four to six weeks later and the cycle begins again [4,6,8,15,37,39,40,41]. The animals thus infected show a summer rhinitis followed by a winter sinusitis [4].…”

“…In sheep, the pathogenic action results from two phenomena, namely a minor mechanical effect and allergic hyper-sensitization phenomena [4,14,29,38,42,43]. In humans, the traumatic and mechanical pathogenic action is preponderant.…”

“…First instar larvae deposited in the autumn (September to October) move up the animal's nasal fossae to reach the frontal sinuses where they mature to reach the third larval stage in two to twelve months and will be released into the nasal mucus the following spring [4]. They fall or are eliminated during sneezing on the soil, where they are transformed into a pupa, from which an adult insect is immersed four to six weeks later and the cycle begins again [4,6,8,15,37,39,40,41]. The animals thus infected show a summer rhinitis followed by a winter sinusitis [4].…”

“…The anterior end or pseudocephalon has two visible buccal hooks (Figure 2). The last metamerus carries the posterior sub-circular stigmata with a central button, Pierced with numerous pores [1][2][3][4][5][6][7][8][9][10][11][12][13][14] (Figure 3). …”

“…Myiasis is defined as the invasion of human and animal organs and tissues by dipteran larvae [1][2][3][4] which optionally or necessarily feed on living or necrotic tissuesfor at least a period of time [5]. This is an essentially veterinary pathology.…”