Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019
In Sweden, an increase in the number of notified cases of cryptosporidiosis was observed 1 October–31 December 2019 (462 domestic cases). Although a single national outbreak was initially suspected, molecular and epidemiological analyses revealed two concurrent national outbreaks and three local out...
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European Centre for Disease Prevention and Control
2025-07-01
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| Series: | Eurosurveillance |
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| Online Access: | https://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2025.30.26.2400643 |
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| author | Jessica Beser |
| author_facet | Jessica Beser |
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| description | In Sweden, an increase in the number of notified cases of cryptosporidiosis was observed 1 October–31 December 2019 (462 domestic cases). Although a single national outbreak was initially suspected, molecular and epidemiological analyses revealed two concurrent national outbreaks and three local outbreaks. Cryptosporidium parvum subtype IIdA22G1c and IIdA24G1 were identified as the cause of the national outbreaks and subtype IIdA20G1e and IIdA21G1 as the cause of the local outbreaks. A case-case study comparing exposures in IIdA22G1c to IIdA24G1 revealed that cases with subtype IIdA22G1c (n = 48) were associated with consumption of a fresh fruit-and-vegetable juice (adjusted odds ratio (aOR) = 17; 95% confidence interval (CI): 1.8–169; p = 0.002). In the local outbreaks with subtype IIdA20G1e and IIdA21G1, cohort studies suggested that cases were associated with consumption of salads. Several coinciding outbreaks with different C. parvum subtypes explained the increase of cryptosporidiosis, and molecular typing was crucial in guiding relevant cross-disciplinary collaboration. |
| format | Article |
| id | doaj-art-e8f2f3c06f104097910b663b1b1b9f71 |
| institution | Kabale University |
| issn | 1560-7917 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | European Centre for Disease Prevention and Control |
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| series | Eurosurveillance |
| spelling | doaj-art-e8f2f3c06f104097910b663b1b1b9f712025-08-20T03:31:41ZengEuropean Centre for Disease Prevention and ControlEurosurveillance1560-79172025-07-01302610.2807/1560-7917.ES.2025.30.26.2400643http://instance.metastore.ingenta.com/content/eurosurveillance/30/26Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019Jessica Beser0ECDC Fellowship Programme, Public Health Microbiology path (EUPHEM), European Centre for Disease Prevention and Control (ECDC), Stockholm, SwedenIn Sweden, an increase in the number of notified cases of cryptosporidiosis was observed 1 October–31 December 2019 (462 domestic cases). Although a single national outbreak was initially suspected, molecular and epidemiological analyses revealed two concurrent national outbreaks and three local outbreaks. Cryptosporidium parvum subtype IIdA22G1c and IIdA24G1 were identified as the cause of the national outbreaks and subtype IIdA20G1e and IIdA21G1 as the cause of the local outbreaks. A case-case study comparing exposures in IIdA22G1c to IIdA24G1 revealed that cases with subtype IIdA22G1c (n = 48) were associated with consumption of a fresh fruit-and-vegetable juice (adjusted odds ratio (aOR) = 17; 95% confidence interval (CI): 1.8–169; p = 0.002). In the local outbreaks with subtype IIdA20G1e and IIdA21G1, cohort studies suggested that cases were associated with consumption of salads. Several coinciding outbreaks with different C. parvum subtypes explained the increase of cryptosporidiosis, and molecular typing was crucial in guiding relevant cross-disciplinary collaboration.https://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2025.30.26.2400643Foodborne OutbreakCohort StudyDiarrhoeaCryptosporidiosisProtozoan InfectionsSource Tracing |
| spellingShingle | Jessica Beser Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019 Eurosurveillance Foodborne Outbreak Cohort Study Diarrhoea Cryptosporidiosis Protozoan Infections Source Tracing |
| title | Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019 |
| title_full | Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019 |
| title_fullStr | Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019 |
| title_full_unstemmed | Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019 |
| title_short | Concurrent Cryptosporidium parvum outbreaks: molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items, Sweden, 2019 |
| title_sort | concurrent cryptosporidium parvum outbreaks molecular characterisation supporting epidemiological investigations leads to identification of different implicated food items sweden 2019 |
| topic | Foodborne Outbreak Cohort Study Diarrhoea Cryptosporidiosis Protozoan Infections Source Tracing |
| url | https://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2025.30.26.2400643 |
| work_keys_str_mv | AT jessicabeser concurrentcryptosporidiumparvumoutbreaksmolecularcharacterisationsupportingepidemiologicalinvestigationsleadstoidentificationofdifferentimplicatedfooditemssweden2019 |