A statewide outbreak of cryptosporidiosis in New South Wales associated with swimming at public pools

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Abstract

From December 1997 to April 1998, 1060 laboratory-confirmed cryptosporidiosis cases were reported in New South Wales, Australia. In a case-control study, compared with 200 controls, the 100 cases were younger (mean age 4.2 versus 7.1 years; P < 0.0001), more likely to report swimming at a public pool (59% versus 38%; adjusted OR and 95% CI = 2.7; 1.4-5.1) and swimming in a dam, river or lake (OR = 4.8; 1.1-20.3) but less likely to report drinking bottled water (OR = 0.4; 0.2-0.9). In subgroup analyses, in rural areas illness was associated mainly with contact with another person with diarrhoea, and in urban illness was associated with swimming in a public pool. Cryptosporidium oocysts were more commonly detected in pools to which at least two notified cases had swum (P = 0.04). Outbreaks of cryptosporidiosis can be prolonged, involve multiple pools and be difficult to control.

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Puech, M. C., McAnulty, J. M., Lesjak, M., Shaw, N., Heron, L., & Watson, J. M. (2001). A statewide outbreak of cryptosporidiosis in New South Wales associated with swimming at public pools. Epidemiology and Infection, 126(3), 389–396. https://doi.org/10.1017/S0950268801005544

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