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Volume 17, Number 3—March 2011


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 2

Exact relative risk for potential risk factors for latent Mycobacterium tuberculosis infection among 13 employees who worked in the quarantine area of an elephant refuge, Tennessee, USA, 2009*

Potential risk factor TST conversion/
risk factor, no. (%) TST conversion/
no risk factor, no. (%) Relative risk (95% CI)†
Close contact with elephant(s) 1/3 (33) 7/10 (70) 0.48 (0.09–2.48)
Participated in elephant trunk washes 0/1 (0) 8/12 (67) NC
Pressure washed barn walls and floors 5/8 (63) 3/5 (60) 1.04 (0.43–2.55)
N95 respirator fit tested annually 2/5 (40) 6/8 (75) 0.53 (0.17–1.68)
“Always” compliant with N95 wear 2/5 (40) 6/8 (75) 0.53 (0.17–1.68)

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

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