Changing trends in intestinal parasitic infections among long-term-residents and settled immigrants in Qatar.

There was also a highly significant effect of age on the prevalence of G. duodenalis (age*presence/absence of infection χ 2 12 = 70.8, P < 0.001).

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There was also a borderline significant effect of age (age*presence/absence of infection χ 2 12 = 21.7, P = 0.041).

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A worrying trend in respect of both helminth and protozoan parasites was the increase in prevalence over the period 2005-2008, in helminth infections prevalence increasing 2-3 fold by 2008, and in protozoan infections by 1.5-2.0 fold.

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