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Interdiscip Perspect Infect Dis. 2011;2011:341065. doi: 10.1155/2011/341065. Epub 2011 Dec 13.

A community outbreak of cryptosporidiosis in sydney associated with a public swimming facility: a case-control study.

Author information

  • 1South Eastern Sydney Illawarra Public Health Unit, Health Reform Transition Organisation-Southern, Locked Mail Bag 9, Wollongong, NSW 2526, Australia.

Abstract

In February, 2008, the South Eastern Sydney Illawarra Public Health Unit investigated an outbreak of cryptosporidiosis within the south east region of Sydney, Australia. Thirty-one cases with laboratory-confirmed cryptosporidiosis and 97 age- and geographically matched controls selected by random digit dialling were recruited into a case-control study and interviewed for infection risk factors. Cryptosporidiosis was associated with swimming at Facility A (matched odds ratio = 19.4, 95% confidence interval: 3.7-100.8) and exposure to household contacts with diarrhoea (matched odds ratio = 7.7, 95% confidence interval: 1.9-31.4) in multivariable conditional logistic regression models. A protective effect for any animal contact was also found (matched odds ratio = 0.2, 95% confidence interval: 0.1-0.7). Cryptosporidium hominis subtype IbA10G2 was identified in 8 of 11 diagnostic stool samples available for cases. This investigation reaffirms the importance of public swimming pools as potential sources of Cryptosporidium infection and ensuring their compliance with water-quality guidelines. The protective effect of animal contact may be suggestive of past exposure leading to immunity.

PMID:
22194741
[PubMed]
PMCID:
PMC3238377
Free PMC Article
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