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Title: Role of rotavirus vaccination on an emerging G8P[8] rotavirus strain causing an outbreak in central Japan
Authors: Sheikh Ariful Hoque
Masaaki Kobayashi
Sayaka Takanashi
Kazi Selim Anwar
Taeko Watanabe
Pattara Khamrin
Shoko Okitsu
Satoshi Hayakawa
Hiroshi Ushijima
Keywords: Biochemistry, Genetics and Molecular Biology
Immunology and Microbiology
Issue Date: 2-Jan-2018
Abstract: © 2017 Elsevier Ltd Background In this study, we examined the effectiveness of RV1 and RV5 vaccines during an outbreak of G8P[8] rotavirus group A strain (G8P[8]-RVA). These vaccines were originally designed to provide protection against severe diseases caused by common circulating strains, whereas G8P[8]-RVA remains emerging strain and partially heterotypic to the vaccines. It is imperative to investigate vaccine effectiveness (VE) against G8P[8]-RVA because this strain appears to be predominant in recent years, particularly, in post-vaccine era. Methods RVA infection and genotypes were confirmed by polymerase chain reaction (PCR) followed by sequence-based genotyping. VE was determined during an outbreak of G8P[8]-RVA in Shizuoka Prefecture, Japan, in February-July 2017, retrospectively, by comparing vaccination status of children suffering from acute gastroenteritis (AGE) between ‘PCR-positive’ and ‘PCR-negative’ cases using conditional logistic regression adjusted for age. Results Among 80 AGE children, RVA was detected in 58 (73%), of which 53 (66%) was G8P[8]-RVA. The clinical characteristics of G8P[8]-RVA and other RVA strains were identically severe. Notably, the attack rates of G8P[8]-RVA in vaccinated (61.1%) and unvaccinated (65.5%) children were almost similar. Indeed, no substantial effectiveness were found against G8P[8]-RVA (VE, 14% [95% CI: −140% to 70%]) or other RVA strains (VE, 58% [95% CI: −20% to 90%]) for mild infections. However, these vaccines remained strongly effective against moderate (VE, 75% [95% CI: 1% to 40%]) and severe (VE, 92% [95% CI: 60% to 98%]) RVA infections. The disease severity including Vesikari score, duration and frequency of diarrhea, and body temperature were significantly lower in vaccinated children. Conclusions This study demonstrates the effectiveness of current RV vaccines against moderate and severe, but not against the mild infections during an outbreak caused by unusual G8P[8]-RVA, which was virtually not targeted in the vaccines.
ISSN: 18732518
Appears in Collections:CMUL: Journal Articles

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