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There is no diagnostic gold standard for latent TB infection (LTBI), but both blood based interferon-gamma release assays (IGRA) and the tuberculin skin test (TST) are used. According to the national guidelines, HCW who have been exposed for TB should be screened and offered preventive anti-TB chemotherapy, but the role of IGRA in HCW screening is still unclear.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>A total of 387 HCW working in clinical and laboratory departments in three major hospitals in the Western region of Norway with possible exposure to TB were included in a cross-sectional study. The HCW were asked for risk factors for TB and tested with TST and the QuantiFERON\u00aeTB Gold In-Tube test (QFT). A logistic regression model analyzed the associations between risk factors for TB and positive QFT or TST.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>A total of 13 (3.4%) demonstrated a persistent positive QFT, whereas 214 (55.3%) had a positive TST (\u2265 6\u00a0mm) and 53 (13.7%) a TST\u2009\u2265\u200915\u00a0mm. Only ten (4.7%) of the HCW with a positive TST were QFT positive. Origin from a TB-endemic country was the only risk factor associated with a positive QFT (OR 14.13, 95% CI 1.37 - 145.38, p\u2009=\u20090.026), whereas there was no significant association between risk factors for TB and TST\u2009\u2265\u200915\u00a0mm. The five HCW with an initial positive QFT that retested negative all had low interferon-gamma (IFN-\u03b3) responses below 0.70\u00a0IU\/ml when first tested.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>We demonstrate a low prevalence of LTBI in HCW working in hospitals with TB patients in our region. The \u201cIGRA-only\u201d seems like a desirable screening strategy despite its limitations in serial testing, due to the high numbers of discordant TST positive\/IGRA negative results in HCW, probably caused by BCG vaccination or boosting due to repetitive TST testing. Thus, guidelines for TB screening in HCW should be updated in order to secure accurate diagnosis of LTBI and offer proper treatment and follow-up.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2458-13-353","type":"journal-article","created":{"date-parts":[[2013,4,17]],"date-time":"2013-04-17T00:17:31Z","timestamp":1366157851000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Screening for latent tuberculosis in Norwegian health care workers: high frequency of discordant tuberculin skin test positive and interferon-gamma release assay negative results"],"prefix":"10.1186","volume":"13","author":[{"given":"Gerd","family":"Gran","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00f6rg","family":"A\u00dfmus","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne Ma","family":"Dyrhol-Riise","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,4,17]]},"reference":[{"issue":"12","key":"5269_CR1","doi-asserted-by":"publisher","first-page":"e494","DOI":"10.1371\/journal.pmed.0030494","volume":"3","author":"R Joshi","year":"2006","unstructured":"Joshi R, Reingold AL, Menzies D, Pai M: Tuberculosis among health-care workers in low- and middle-income countries: a systematic review. 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