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Volume 12, Number 5—May 2006
THEME ISSUE
Tuberculosis Special Section

Dispatch

Multidrug-resistant Tuberculosis in Military Recruits

Grace Freier*, Allen Wright*, Gregory Nelson*, Eric Brenner†, Sundari Mase‡, Sybil Tasker§, Karen L. Matthews¶, and Bruce K. Bohnker¶Comments to Author 
Author affiliations: *Naval Hospital, Beaufort, South Carolina, USA; †South Carolina Department of Health and Environmental Control, Columbia, SC, USA; ‡California Department of Health, Sacramento, California, USA; §National Naval Medical Center, Bethesda, Maryland, USA; ¶Navy Environmental and Preventive Medicine Unit-2, Norfolk, Virginia, USA

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Table 2

Tuberculin skin test (TST) reactor rate by exposure duration

Contact duration Total Old reactors TSTs placed New reactor Reactor rate (%) Group reactor rate (%)
Casual contacts* Likely none 25 0 19 1 5.26 3.2
Possible 256 13 233 7 3.00
Close contacts Unknown 34 1 33 1 3.03 9.09
>3 weeks†
Sep 13–Oct 12 70 1 70 3 4.29
1–3 weeks
Oct 12–21 42 0 31 6 19.35
<1 week
Oct 21–26 12 0 9 3 33.33
Total 439 15 395 21 5.32

*The close contacts were more likely to convert than the incidental contacts. Risk ratio (RR) 2.86, 95% confidence interval (CI) 1.22–6.74, p = 0.011.
†The close contacts with >3 weeks of exposure were less likely to convert than those with <3 weeks of exposure. RR 0.19, 95% CI 0.05–0.66, p = 0.0032.

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