Volume 17, Number 3—March 2011
Research
Elephant-to-Human Transmission of Tuberculosis, 2009
Rendi Murphree
, Jon V. Warkentin, John R. Dunn, William Schaffner, and Timothy F. Jones
, Jon V. Warkentin, John R. Dunn, William Schaffner, and Timothy F. Jones
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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