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Volume 5, Number 6—December 1999

Research

Epidemiologic Studies of Cyclospora cayetanensis in Guatemala

Caryn Bern*†Comments to Author , Beatriz Hernandez†, Maria Beatriz Lopez†, Michael J. Arrowood*, Maricruz Alvarez de Mejia†, Ana Maria de Merida†, Allen W. Hightower*, Linda Venczel‡, Barbara L. Herwaldt*, and Robert E. Klein†
Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †Universidad del Valle, Guatemala City, Guatemala; and ‡University of North Carolina, Chapel Hill, North Carolina, USA

Main Article

Table 1

Prevalence of Cyclospora in specimens from outpatients attending three hospitals and two health centers. April 6, 1997, to March 19, 1998

Prevalence by presence of symptoms
Prevalence by age group n/N (%) with n/N (%) without
Age (yrs) na/Nb (%) RR (95% CI)c gastroenteritis gastroenteritis RR (95% CI)d
<1.5 10/844 (1.2) 1.7 (0.8, 3.8) 7/502 (1.4) 3/330 (0.9) 1.5 (0.4, 5.9)
1.5-4 41/1,160 (3.5) 5.1 (2.8, 9.1) 31/583 (5.3) 10/567 (1.8) 3.0 (1.5, 6.1)
5-9 31/813 (3.8) 5.5 (3.0, 10.1) 22/451 (4.9) 8/354 (2.3) 2.2 (1.0, 4.8)
10-14 4/328 (1.2) 1.8 (0.6, 5.2) 2/147 (1.4) 2/176 (1.1) 1.2 (0.2, 8.4)
>14 15/2150 (0.7) Referent 8/958 (0.8) 7/1,181 (0.6) 1.4 (0.5, 3.9)
All ages 101/5,295e (1.9) -- 70/2,641 e (2.7) 30/2,609e (1.1) 2.3 (1.5, 3.5)

an represents the number positive for Cyclospora
.bN represents the number of specimens in each category.
cEach age group compared with patients >14 years of age.
dSpecimens associated with gastroenteritis versus those without gastroenteritis.
eApparent inconsistencies in denominator data are due to the following missing data and exclusions. Data for 32 patients of the clinic serving the HIV-infected population were excluded. Age and symptom data were missing for 187 specimens; symptom data only were missing for 45 specimens.

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