2014
DOI: 10.1017/s095026881400243x
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Symptomatic and asymptomatic secondary transmission of Cryptosporidium parvum following two related outbreaks in schoolchildren

Abstract: SUMMARYTwo related outbreaks (in 2009 and 2012) of cryptosporidiosis in Norwegian schoolchildren during a stay at a remote holiday farm provided us with a natural experiment to investigate possible secondary transmission of Cryptosporidium parvum IIa A19G1R1. After the children had returned home, clinical data and stool samples were obtained from their household contacts. Samples were investigated for the presence of Cryptosporidium oocysts by immunofluorescence antibody test. We found both asymptomatic and sy… Show more

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Cited by 28 publications
(40 citation statements)
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“…Natural transmission studies from analyzing secondary infections and those in farm settings has shown that dominant subtypes can be stable for many years or they can vary from year to year. For example, the outbreaks among visiting children on a holiday farm in Norway showed the same gp60 subtype, IIaA19G1R1, was still circulating over several years and an investigation into secondary transmission within households after the children returned home also found the same subtype (103). While there was no evidence at the gp60 gene of mixed populations in this example, in farm settings it is common for multiple subtypes to be present (104,105).…”
Section: Multiplicity Of Infection In Cryptosporidiummentioning
confidence: 75%
“…Natural transmission studies from analyzing secondary infections and those in farm settings has shown that dominant subtypes can be stable for many years or they can vary from year to year. For example, the outbreaks among visiting children on a holiday farm in Norway showed the same gp60 subtype, IIaA19G1R1, was still circulating over several years and an investigation into secondary transmission within households after the children returned home also found the same subtype (103). While there was no evidence at the gp60 gene of mixed populations in this example, in farm settings it is common for multiple subtypes to be present (104,105).…”
Section: Multiplicity Of Infection In Cryptosporidiummentioning
confidence: 75%
“…Прямая зоонозная передача C. parvum доказана для нескольких подтипов семейства IIa: IIaA15G2R1 (характерная инфекция молодняка крупного рогатого скота), IaA19G1R1 (вызывает вспышки заболевания у ягнят), IIaA20G2R1 (вовлечен в спорадические случаи и вспышки инфекций у животных). Субтипы криптоспоридий, принадлежащие к аллельному семейству IId, также вызывают заболевание у человека [17,18].…”
Section: эпидемиология криптоспоридиоза и генетическая вариабельностьunclassified
“…However, only half of these secondary cases manifested with diarrhea; the others had asymptomatic carriage [32]. An outbreak in Norwegian school children demonstrated a secondary attack rate of 17 % [33]. Additionally, living in a household with young children has consistently been identified as a risk factor for infection [11•, 34].…”
Section: Transmissionmentioning
confidence: 99%