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An outbreak of viral meningitis associated with a public swimming pond 2005

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An outbreak of viral meningitis associated with a public swimming pond

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From July to October 2001, 215 cases of aseptic meningitis occurred among the inhabitants of the German city of Kassel and neighbouring counties. A matched case-control study identified bathing in a public, nature-like pond during the beginning of the outbreak as a risk factor for disease [matched odds ratio (mOR) 44.8, 95% confidence interval (CI) 3.9–515.6]. Among bathers, patients with meningitis spent more time in the water (mOR 18.8, 95% CI 2.0–174.1) and swallowed water more frequently (mOR=7 .3, 95% CI 0.7–81.8). Of 30 cerebrospinal fluid samples tested, echovirus 30 was cultured from 16, and echovirus 13 from seven. An echovirus 30 sequence obtained from one pond water sample showed a 99% nucleotide and 100% amino-acid homology with patient isolates. This outbreak demonstrates the potential of nature-like swimming ponds to cause widespread community infection with substantial public health impact.

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