Complexity in estimating recent tuberculosis transmission among predominantly immigrant school children in Stockholm, Sweden 2006.

In January 2006, an after-school carer in Stockholm was diagnosed with open pulmonary tuberculosis (TB) after having been symptomatic for 3 months. The aim of this paper is to illustrate the difficulties encountered in estimating recent transmission of TB among children in an immigrant school population. A tuberculin skin test was performed on 261 pupils aged 6-15 y and an additional interferon-gamma release assay was performed on 20 children.