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Volume 15, Number 7—July 2009
CME ACTIVITY - Research

Cluster of Sylvatic Epidemic Typhus Cases Associated with Flying Squirrels, 2004–2006

Alice S. Chapman1, David L. Swerdlow, Virginia M. Dato, Alicia D. Anderson, Claire E. Moodie, Chandra Marriott, Brian Amman, Morgan J. Hennessey, Perry Fox, Douglas B. Green, Eric Pegg, William L. Nicholson, Marina E. Eremeeva, and Gregory A. DaschComments to Author 

Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (A.S. Chapman, D.L. Swerdlow, A.D. Anderson, C.E. Moodie, B. Amman, M. Hennessey, D.B. Green, E. Pegg, W.L. Nicholson, M.E. Eremeeva, G.A. Dasch); Pennsylvania Department of Health, Pittsburgh, Pennsylvania, USA (V.M. Dato, C. Marriott, P. Fox)

Main Article

Table 2

Selected characteristics of surveyed staff members at wilderness camp in Pennsylvania, March 2006*

Characteristic Case-patients (n = 4) Non–case-patients (n = 29) Case-patients surveyed† (n = 12)
Median age, y‡
28.5 (range 26–40)
38.7 (range 21–69)
35 (range 23–63)
Gender
Male‡ 4 (100) 23 (79) 11 (92)
Female
0
6 (21)
1 (8)
Job classification
Counselor‡ 4 (100) 14 (48) 7 (58)
Maintenance 0 3 (10) 1 (8.3)
Administrative 0 5 (17) 1 (8.3)
Support staff 0 5 (17) 1 (8.3)
Night security 0 1 (3.4) 2 (17)
No answer
0
1 (3.4)
0
Employment, y‡
2.5 (range 1.8–3.9)
2.7 (range 0.1–30.8)
1.1 (range 0.2–26.3)
Ever slept in cabins
Yes‡ 4 (100) 19 (66) 8 (66.6)
No 0 10 (34) 3 (25)
Don’t know
0
0
1 (8.3)
Contact with (touching) flying squirrel
Yes‡ 1 (25) 7 (24) 1 (8)
No 3 (75) 20 (69) 11 (92)
Don’t know 0 1 (3.4) 0
No answer
0
1 (3.4)
0
Contact with (touching) flying squirrel nests§
Yes 2 (50) 3 (10) 0
No 1 (25) 17 (58.6) 10 (83)
Don’t know 1 (25) 8 (28) 2 (17)
No answer
0
1 (3.4)
0
Ever slept in cabin A
Yes‡ 4 (100) 13 (45) 4 (33)
No
0
16 (55)
8 (67)
Ever slept in bunk B in cabin A
Yes¶ 4 (100) 9 (69) 2 (50)
No 0 3 (23) 1 (25)
No answer
0
1 (7.6)
1 (25)
Cumulative months in cabin A# 17.00 (range 8–43) 2.00 (range 0–13) 0.25 (range 0–30)

*Data given as frequency (%) except as indicated.
†Responses of staff members who declined serologic testing. Remaining respondents classified as case-patients or non–case-patients, according to results of serologic testing for Rickettsia prowazekii and patients’ medical histories.
‡These characteristics did not demonstrate statistical difference between case-patients and non–case-patients.
§Odds ratio 11.3 (95% confidence interval 0.51–474) for association between contact with flying squirrel nests and sylvatic typhus.
¶Association with sleeping in bunk B of cabin A significant at p = 0.02.
#Significant at p = 0.04.

Main Article

1Current affiliation: US Air Force, Scott Air Force Base, Illinois, USA.

Page created: December 03, 2010
Page updated: December 03, 2010
Page reviewed: December 03, 2010
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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