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Euro Surveill. Two geographically separated food-borne outbreaks in Sweden linked by an unusual Cryptosporidium parvum subtype, October 2010

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  • Euro Surveill. Two geographically separated food-borne outbreaks in Sweden linked by an unusual Cryptosporidium parvum subtype, October 2010

    [Source: Eurosurveillance, full text: (LINK). Abstract, edited.]
    Eurosurveillance, Volume 17, Issue 46, 15 November 2012

    Surveillance and outbreak reports

    Two geographically separated food-borne outbreaks in Sweden linked by an unusual Cryptosporidium parvum subtype, October 2010


    A Gherasim ()<SUP>1</SUP><SUP>,2</SUP>, M Lebbad<SUP>3</SUP>, M Insulander<SUP>4</SUP>, V Decraene<SUP>1</SUP><SUP>,2</SUP>, A Kling<SUP>2</SUP>, M Hjertqvist<SUP>2</SUP>, A Wallensten<SUP>2</SUP><SUP>,5</SUP>
    1. European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
    2. Department of Analysis and Prevention, Swedish Institute for Communicable Disease Control (SMI), Solna, Sweden
    3. Department of Diagnostics and Vaccinology, Swedish Institute for Communicable Disease Control, Solna, Sweden
    4. Department of Communicable Disease Control and Prevention, Stockholm County, Sweden
    5. Uppsala University, Uppsala, Sweden
    <HR>
    Citation style for this article: Gherasim A, Lebbad M, Insulander M, Decraene V, Kling A, Hjertqvist M, Wallensten A. Two geographically separated food-borne outbreaks in Sweden linked by an unusual Cryptosporidium parvum subtype, October 2010. Euro Surveill. 2012;17(46):pii=20318. Available online: http://www.eurosurveillance.org/View...rticleId=20318
    Date of submission: 16 May 2011
    <HR>The number of sporadic cases of Cryptosporidium identified in the Stockholm county area increased above the expected limit during October 2010. Additionally, two food-borne outbreaks of cryptosporidiosis occurred in two other Swedish cities: Ume? (4 October) and ?rebro (9 October). The outbreak investigations did not reveal any responsible food item, however fresh herbs were suspected. Thirty stool samples, originating from all three events, tested positive for Cryptosporidium oocysts. Polymerase chain reaction (PCR) and subsequent restriction fragment length polymorphism (RFLP) revealed that 27 individuals were infected with C. parvum, two with C. hominis, and one with C. felis. Using sequence analysis of the GP60 glycoprotein gene, a polymorphic marker with high intra-species diversity, we identified the same C. parvum subtype IIdA24G1 in samples from both the Ume? outbreak and the Stockholm area cases, thus indicating a possible outbreak in the Stockholm area and establishing a link between these two events. C. parvum IIdA24G1 has not previously been described in connection with a food-borne outbreak. For the outbreak in ?rebro, another subtype was identified: C. parvum IIdA20G1e. These findings demonstrate that subtyping C. parvum isolates using GP60 gene amplification can be used to link cases in an outbreak investigation and we recommend its use in future similar events.
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