Epidemiology and Infection



Recurrent outbreaks of cryptosporidiosis associated with calves among students at an educational farm programme, Minnesota, 2003


K. M. KIANG a1a2, J. M. SCHEFTEL a1, F. T. LEANO a3, C. M. TAYLOR a3, P. A. BELLE-ISLE a3, E. A. CEBELINSKI a3, R. DANILA a1 and K. E. SMITH a1c1
a1 Acute Disease Investigation and Control Section, Minnesota Department of Health, Minneapolis, MN, USA
a2 Epidemic Intelligence Service, Epidemiology Program Office, Centers for Disease Control and Prevention, Atlanta, GA, USA
a3 Public Health Laboratory, Minnesota Department of Health, Minneapolis, MN, USA

Article author query
kiang km   [PubMed][Google Scholar] 
scheftel jm   [PubMed][Google Scholar] 
leano ft   [PubMed][Google Scholar] 
taylor cm   [PubMed][Google Scholar] 
belle-isle pa   [PubMed][Google Scholar] 
cebelinski ea   [PubMed][Google Scholar] 
danila r   [PubMed][Google Scholar] 
smith ke   [PubMed][Google Scholar] 

Abstract

Enteric illness outbreaks among middle-/high-school students in consecutive semesters of an educational farm programme were investigated with retrospective cohort studies. During the first outbreak, 31/92 (34%) interviewed students were ill. Risk factors included participating in animal science class (RR 8·1, 95% CI 1·2–55·2) and contact with calves (RR 4·2, 95% CI 1·1–16·2). Stool samples from seven students and two calves yielded Cryptosporidium parvum. Students cared for animals in street clothes and practised poor hand washing. During the second outbreak, 37/81 (46%) interviewed animal science students were ill. Risk factors included having visible manure on hands, and wearing coveralls and boots. Stool samples from seven students and eight calves yielded C. parvum. Student hand washing was still inadequate. Coveralls/boots were cleaned infrequently and removed after hand washing. These outbreaks of cryptosporidiosis resulted from calf contact and inadequate hygiene practices. The failure to adequately implement recommended interventions contributed to the second outbreak.

(Accepted September 21 2005)
(Published Online May 3 2006)


Correspondence:
c1 Minnesota Department of Health, Acute Disease Investigation and Control Section, 717 Delaware St. SE, Minneapolis, MN, USA 55414. (Email: kirk.smith@state.mn.us)


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