Comprehensive study based on mtDNA signature (nad1) providing insights on Echinococcus granulosus s.s. genotypes from Pakistan and potential role of buffalo-dog cycle.

Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases
Naunain MehmoodZafar Iqbal Khan

Abstract

Pakistan has long been considered neglected endemic region for Echinococcus granulosus. Limited surveillance studies have failed to epidemiologically draw complete picture on geographical presence and etiological agents of cystic echinococcosis. Amidst such lacunae, current study explored main transmission routes of this disease through molecular characterization of hydatid cyst isolates obtained from sheep (n = 35), goats (n = 26), cattle (n = 30) and buffalo (n = 30) from the four provinces of Pakistan. Two strains of E. granulosus sensu stricto, G1/G3, and their haplotypes were observed to be cycling in sympatry in the domestic ungulate populations. G3 genotype had higher prevalence (66.94%) in the hosts compared to G1 genotype (33.06%) which was not surprising, considering the large buffalo population in Pakistan. Haplotypic analysis revealed presence of 9 different haplotypes configured in a double clustered network with two centrally positioned haplotypes referred to as G3 (PKH1) and G1 (PKH6). Population demographics and genetic variability indices suggested expanding parasitic population in multiple host spectrum. Elucidating local transmission patterns of E. granulosus sensu stricto, buffalo-dog cycle emerged as one of...Continue Reading

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