Sapovirus, Norovirus and Rotavirus Detections in Stool Samples of Hospitalized Finnish Children With and Without Acute Gastroenteritis
Abstract
Background: Sapovirus, norovirus and rotavirus are major causes of childhood acute gastroenteritis (AGE) globally. Asymptomatic infections of these viruses have not been extensively studied. Aim: To examine the prevalence and the genetic variations of sapovirus, norovirus and rotavirus in children with and without symptoms of AGE. Methods: We collected 999 stool samples from children under 16 years old from September 2009 to August 2011 at Tampere University Hospital, Finland. In total 442 children (44%) had symptoms of AGE and 557 patients (56%) had acute respiratory tract infection (ARTI) only. Samples were examined for sapovirus, norovirus and rotavirus using reverse transcription-polymerase chain reaction and the positive amplicons were sequenced. Results: Totally 54% and 14% of the patients in AGE and ARTI groups, respectively, tested positive. All viruses were more frequently detected in AGE patients than in ARTI patients (norovirus, 25% vs. 7.2%, respectively; rotavirus, 24% vs. 6.1%; sapovirus, 5.2% vs. 1.4%). In ARTI patients, the cases were seen most frequently during the first two years of life. Norovirus was the most detected pathogen in both groups with genogroup GII covering ≥97% of norovirus strains. Sapovirus was mostly detected in children under 18 months old without predominating genotype. Rotavirus was often detected after recent rotavirus vaccination and 18% and 88% of the strains were rotavirus vaccine-derived in AGE and ARTI groups, respectively.…
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