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Cryptosporidium species and subtypes in Norway: predominance of C. parvum and emergence of C. mortiferum
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Cryptosporidium species and subtypes in Norway: predominance of C. parvum and emergence of C. mortiferum
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Journal Article
Cryptosporidium species and subtypes in Norway: predominance of C. parvum and emergence of C. mortiferum
2024
Overview
PCR-based diagnostics has revealed the previously largely unknown
transmission and infections in high-income countries. This study aimed to determine domestic and imported subtypes of
species in Norway, evaluate their demographic distribution, and identify potential small outbreaks.
-positive human faecal samples were obtained from six medical microbiology laboratories between February 2022 and January 2024, together with 22
-positive animal samples. Species and subtypes were identified by sequencing PCR products from gp60 and SSU rRNA genes. Most cryptosporidiosis cases occurred during late summer/early autumn, primarily in children and young adults. Of 550 human samples, 359 were successfully characterized molecularly (65%), revealing infection with 10 different
species.
occurred in 245 (68%) human isolates with IIa and IId being major allele families, with distinct regional distribution patterns of common subtypes. A kindergarten outbreak with 5 cases was due to
IIaA14G1R1.
was identified in 33 (9.2%) human cases of which 24 were known to be of domestic origin, making it the second most common species in human autochthonous cases in Norway. All
isolates were of the same genotype; XIVaA20G2T1, including 13 cases from a suspected small outbreak in Trøndelag.
occurred in 68 typed cases (19%), but mostly in infections acquired abroad, with allele families Ib and If occurring most often. In conclusion, this study of recent
spp. and subtypes in Norway, highlights the predominance of
and the emergence of
among autochthonous cases.
Publisher
Taylor & Francis Ltd,Taylor & Francis,Taylor & Francis Group
Subject
/ Adult
/ Aged
/ Animals
/ Child
/ Cryptosporidiosis - epidemiology
/ Cryptosporidiosis - parasitology
/ Cryptosporidium - classification
/ Cryptosporidium - isolation & purification
/ Cryptosporidium parvum - classification
/ Cryptosporidium parvum - genetics
/ Cryptosporidium parvum - isolation & purification
/ Female
/ Genotype
/ Humans
/ imported
/ Infant
/ Male
/ Protozoa
