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Lobato and Hopewell conducted this case-control study to determine if there is an increased risk for Mycobacterium tuberculosis (Mtb) infection in children who have traveled to or been in a household with visitors from countries that have a high prevalence of tuberculosis. The authors selected a convenience sample of 933 children aged less than 6 years and seen at public health clinics in 7 California counties in 1996 for detailed questioning about travel, visitation, and other risk factors for Mtb infections. The Mantoux skin tests (PPD) were performed when there was a high infection risk (residence …
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