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Volume 9, Number 3—March 2003

Research

Tularemia on Martha’s Vineyard: Seroprevalence and Occupational Risk

Katherine A. Feldman*Comments to Author , Donna Stiles-Enos†, Kathleen Julian*, Bela T. Matyas‡, Sam R. Telford§, May C. Chu*, Lyle R. Petersen*, and Edward B. Hayes*
Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †Martha’s Vineyard Hospital, Oak Bluffs, Massachusetts, USA; ‡The Massachusetts Department of Public Health, Boston, Massachusetts, USA; §The Harvard School of Public Health, Cambridge, Massachusetts, USA

Main Article

Table 2

Risk factors among landscapers (dichotomous variables), Martha’s Vineyard, 2001a

Potential risk factor Seropositive among exposed
no. (%) Seropositive among
unexposed
no. (%) Prevalence ratio
(95% CI) Yates corrected
p value
Mow or brush-cut during summer
12/116 (10.3)
0/16 (0)
Undef (undef, undef)
0.38
Recall mowing or brush-cutting over dead animal
4/30 (13.3)
8/79 (10.1)
1.3 (0.4 to 4.1)
0.90
Use power blower during summer
11/72 (15.3)
1/60 (1.7)
9.2 (1.2 to 69.0)
0.02
Ticks crawling on body
10/112 (8.9)
2/18 (11.1)
0.8 (0.2 to 3.4)
0.89
Ticks attached to skin
4/73 (5.5)
8/59 (13.6)
0.4 (0.1 to 1.3)
0.19
Seen sick or dead rabbits in past year 6/60 (10) 6/71 (8.5) 1.2 (0.4 to 3.5) 0.99

aCI, confidence interval; undef = undefined.

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