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313 sheep were examined in 1 996 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 LI, 9.7 to 43.9 % for L2 and 8.4 to 23.0 % for L3. The sheep were the leastdoi:10.1051/parasite/2004112235 pmid:15224587 fatcat:2jeywwxyvve6roiydxsk4rlumi