|Abstract||Background: Travel and migration from developing regions, where tropical diseases are common, to more developed
industrialised nations can contribute to the introduction and subsequent spread of infections. With its rapidly expanding
economy, Qatar has attracted vast numbers of immigrant workers in the last two decades, often from countries with
poor socio-economic levels. Many used to arrive with patent intestinal parasitic infections.
Methods: We analysed the prevalence of helminth infections in a dataset of 29,286 records of subjects referred for stool
examination at the Hamad Medical Corporation over the course of a decade (2005 to 2014, inclusive).
Results: Overall prevalence of combined helminth infections was low (1.86 %) but there were significant temporal
trends, age and sex effects and those arising from the region of origin of the subjects. The most common
helminths were hookworms (overall prevalence 1.22 %), which accounted for 70.1 % of cases, and therefore
patterns for combined helminth infections were largely driven by hookworms. In both cases, and also in Trichuris
trichiura and Ascaris lumbricoides, prevalence peaked in 2008, since when prevalence has been steadily falling.
Helminth infections were largely concentrated among subjects from five Asian countries (Nepal, Bangladesh, Sri
Lanka, India and Pakistan), and there was a highly biased prevalence in favour of male subjects in all cases.
Prevalence of all three nematodes peaked in age class 7 (mean age 25.5 years, range = 20–29) and there were
significant interactions between region of origin, sex of subjects and prevalence of hookworms.
Conclusion: These results offer optimism that prevalence will continue to decline in the years ahead, especially if
control is targeted at those most at risk of carrying infections.