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Post-infection symptoms following two large waterborne outbreaks of Cryptosporidium hominis in Northern Sweden, 2010-2011
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Infectious Diseases.
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2015 (English)In: BMC Public Health, ISSN 1471-2458, E-ISSN 1471-2458, Vol. 15, 529Article in journal (Refereed) Published
Abstract [en]

Background: In 2010-2011, two large waterborne outbreaks caused by Cryptosporidium hominis affected two cities in Sweden, Ostersund and Skelleftea. We investigated potential post-infection health consequences in people who had reported symptoms compatible with cryptosporidiosis during the outbreaks using questionnaires. Methods: We compared cases linked to these outbreaks with non-cases in terms of symptoms present up to eleven months after the initial infection. We examined if cases were more likely to report a list of symptoms at follow-up than non-cases, calculating odds ratios (OR) and 95 % confidence intervals (CI) obtained through logistic regression. Results: A total of 872 (310 cases) and 743 (149 cases) individuals responded to the follow-up questionnaires in Ostersund and Skelleftea respectively. Outbreak cases were more likely to report diarrhea (Ostersund OR: 3.3, CI: 2.0-5.3. Skelleftea OR: 3.6, CI: 2.0-6.6), watery diarrhea (Ostersund OR: 3.4, CI: 1.9-6.3. Skelleftea OR: 2.8, CI: 1.5-5.1) abdominal pain (Ostersund OR: 2.1, CI: 1.4-3.3, Skelleftea OR: 2.7, CI: 1.5-4.6) and joint pain (Ostersund OR: 2.0, CI: 1.2-3.3, Skelleftea OR: 2.0, CI: 1.1-3.6) at follow-up compared to non-cases. Conclusions: Our findings suggest that gastrointestinal-and joint symptoms can persist several months after the initial infection with Cryptosporidium and should be regarded as a potential cause of unexplained symptoms in people who have suffered from the infection.

Place, publisher, year, edition, pages
2015. Vol. 15, 529
Keyword [en]
Cryptosporidium hominis, Post-infection symptoms, Cryptosporidiosis, Sequelae
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
URN: urn:nbn:se:uu:diva-256996DOI: 10.1186/s12889-015-1871-6ISI: 000355909500001PubMedID: 26041728OAI: oai:DiVA.org:uu-256996DiVA: diva2:832430
Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2017-12-04Bibliographically approved

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