title: Epidemiology of sheep infection by Oestrus ovis in Algeria.
abstract: 313 sheep were examined in 1996 to assess the importance and seasonal evolution of Oestrus ovis infection in the Algerian region of El-Tarf. Prevalence was found to be 67.4%. The larval burden was 18 larvae by infected sheep. The prevalence was higher in older sheep than in lambs; intensity was similar. The different larval stages were found all along the year in sheep with prevalence ranging from 33.1 to 80.5% for L1, 9.7 to 43.9% for L2 and 8.4 to 23.0% for L3. The sheep were the least infected in winter (prevalence from 35.7 to 44% and intensity seven to ten larvae per sheep). The highest infection was found during the warm season (spring to autumn, prevalence from 62 to 90% and intensity ranging from 15 to 25). This larval evolution profile suggested the existence of one long cycle (November-April) and possibly two shorts cycles (May-October). This epidemiological pattern is similar to that in Morocco but was slightly different from the situation in Tunisia where the winter cycle was apparently of lesser importance.
authors.affiliation: Institut Agro-Vétérinaire, BP 05, 36000 El-Tarf, Algérie.
authors.forename: A
authors.initials: A
authors.lastname: Benakhla
authors.forename: S
authors.initials: S
authors.lastname: Sedraoui
authors.forename: D E
authors.initials: DE
authors.lastname: Benouareth
authors.forename: J
authors.initials: J
authors.lastname: Cabaret
authors.forename: C
authors.initials: C
authors.lastname: Boulard
mesh_terms: D000367:Age Factors; D000462:Algeria / Q000453:epidemiology; D000818:Animals; D004175:Diptera / Q000254:growth & development*; D005260:Female; D008297:Male; D009198:Myiasis / Q000453:epidemiology / Q000662:veterinary*; D015995:Prevalence; D012621:Seasons; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology*