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Investigators conducted two surveys of intestinal worm infestation among 1,000 adolescent agricultural workers in Country Y.

At the first survey, they found that 620 adolescents were infested with one or more types of worms. After treating all adolescents found to be positive, investigators returned six months later and tested all 1,000 adolescents again. This time they found 390 adolescents infested.

What is the prevalence of worm infestation among adolescents in the second survey?

Answer :

Final answer:

The prevalence of worm infestation among the adolescents in Country Y in the second survey was 39%, indicating a significant reduction after treatment. The calculation was made by dividing the number of infected adolescents by the total number of adolescents tested.

Explanation:

The subject of the question pertains to health, with a specific focus on epidemiology and parasitology. The question asks to determine the prevalence of worm infestation among adolescents in the second survey. Prevalence can be computed as the number of existing cases divided by the total population. In this instance, the number of existing cases is 390 (number of infected adolescents in the second survey) and the total population is 1,000 (total number of adolescents tested). So, the formula would look like: (390 / 1,000) x 100. Accordingly, the prevalence of worm infestation among adolescents in the second survey is 39%. This indicates that after treatment was given, there was a significant reduction in worm infestation among the adolescents.

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