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Ballard, Sarah-Blythe; Requena, David; Mayta, Holger; Sanchez, Gerardo J; Oyola-Lozada, Maria G; Colquechagua Aliaga, Fabiola D; Cabrera, Lilia; Vittet Mondonedo, Macarena D; Taquiri, Carmen; Tilley, Capt Drake H; Simons, Cdr Mark P; Meza, Rina A; Bern, Caryn; Saito, Mayuko; Figueroa-Quintanilla, Dante A; Gilman, Robert H
Pediatrics (Evanston), 01/2022, Letnik: 149, Številka: 1Journal Article
To inform next steps in pediatric diarrhea burden reduction by understanding the shifting enteropathogen landscape after rotavirus vaccine implementation. We conducted a case-control study of 1788 medically attended children younger than 5 years, with and without gastroenteritis, after universal rotavirus vaccine implementation in Peru. We tested case and control stools for 5 viruses, 19 bacteria, and parasites; calculated coinfection-adjusted attributable fractions (AFs) to determine pathogen-specific burdens; and evaluated pathogen-specific gastroenteritis severity using Clark and Vesikari scales. Six pathogens were independently positively associated with gastroenteritis: norovirus genogroup II (GII) (AF 29.1, 95% confidence interval CI: 28.0-32.3), rotavirus (AF 8.9, 95% CI: 6.8-9.7), sapovirus (AF 6.3, 95% CI: 4.3-7.4), astrovirus (AF 2.8, 95% CI: 0.0-4.0); enterotoxigenic Escherichia coli heat stable and/or heat labile and heat stable (AF 2.4, 95% CI: 0.6-3.1), and Shigella spp. (AF 2.0, 95% CI: 0.4-2.2). Among typeable rotavirus cases, we most frequently identified partially heterotypic strain G12P8 (54 of 81, 67%). Mean severity was significantly higher for norovirus GII-positive cases relative to norovirus GII-negative cases (Vesikari 12.7 vs 11.8; P < .001 and Clark 11.7 vs 11.4; P = .016), and cases in the 6- to 12-month age range relative to cases in other age groups (Vesikari 12.7 vs 12.0; P = .0002 and Clark 12.0 vs 11.4; P = .0016). Norovirus is well recognized as the leading cause of pediatric gastroenteritis in settings with universal rotavirus vaccination. However, sapovirus is often overlooked. Both norovirus and sapovirus contribute significantly to the severe pediatric disease burden in this setting. Decision-makers should consider multivalent vaccine acquisition strategies to target multiple caliciviruses in similar countries after successful rotavirus vaccine implementation.
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