Phylogenetic tree constructed using 50 nad 4 sequences from Haemonchus contortus from five different countries. The bootstrap values of >50% were displayed in the tree. Forty nad 4 sequences of H. contortus were retrieved from the GenBank database and used for comparison; ten sequences represented each country: the USA (accession nos. AF070736-AF070745 ); Italy (AJ429793-AJ429802 ); Malaysia and Yemen (HQ660353-HQ660362 and HQ660269-HQ660278 ). Haemonchus placei (accession no. AF070785) was used as the outgroup. Abbreviations: Ch: China; It: Italy; Ma: Malaysia; USA: United States of America; Ye: Yemen.