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Volume 17, Number 3—March 2011

Research

Elephant-to-Human Transmission of Tuberculosis, 2009

Rendi MurphreeComments to Author , Jon V. Warkentin, John R. Dunn, William Schaffner, and Timothy F. Jones
Author affiliations: Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (R. Murphree); Tennessee Department of Health, Nashville, Tennessee, USA (R. Murphree, J.V. Warkentin, J.R. Dunn, T.F. Jones); Vanderbilt University School of Medicine, Nashville (W. Schaffner, T.F. Jones)

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Table 1

Exact relative risk for potential risk factors for Mycobacterium tuberculosis infection among 46 elephant refuge employees, Tennessee, USA, 2009*

Potential risk factor TST conversion/
risk factor, no. (%) TST conversion/
no risk factor, no. (%) Relative risk (95% CI)†
Foreign born 2/6 (33) 7/40 (18) 1.91 (0.51–7.10)
International travel past 5 y 5/19 (26) 4/27 (14) 1.78 (0.58–5.76)
Exposure to person(s) with TB 0/4 (0) 9/42 (21) NC
Previous health care facility work 1/8 (13) 8/38 (21) 0.59 (0.09–4.10)
Previous correctional facility work 0/4 (0) 9/42 (21) NC
Previous homeless shelter work 0/1 (0) 9/45 (20) NC
Close contact with elephant(s) 2/11 (18) 7/35 (20) 0.91 (0.22–3.75)
Quarantine area exposure during 2009 8/13 (62) 1/33 (3) 20.31 (2.81–146.69)

*TST, tuberculin skin test; CI, confidence interval; TB, tuberculosis; NC, not computed.
†Relative risk and confidence intervals were not computed when at least 1 cell contained zero.

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