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Published in: BMC Infectious Diseases 1/2020

Open Access 01-12-2020 | Research article

Rotavirus group A genotype circulation patterns across Kenya before and after nationwide vaccine introduction, 2010–2018

Authors: Mike J. Mwanga, Betty E. Owor, John B. Ochieng, Mwanajuma H. Ngama, Billy Ogwel, Clayton Onyango, Jane Juma, Regina Njeru, Elijah Gicheru, Grieven P. Otieno, Sammy Khagayi, Charles N. Agoti, Godfrey M. Bigogo, Richard Omore, O. Yaw Addo, Seheri Mapaseka, Jacqueline E. Tate, Umesh D. Parashar, Elizabeth Hunsperger, Jennifer R. Verani, Robert F. Breiman, D. James Nokes

Published in: BMC Infectious Diseases | Issue 1/2020

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Abstract

Background

Kenya introduced the monovalent G1P [8] Rotarix® vaccine into the infant immunization schedule in July 2014. We examined trends in rotavirus group A (RVA) genotype distribution pre- (January 2010–June 2014) and post- (July 2014–December 2018) RVA vaccine introduction.

Methods

Stool samples were collected from children aged < 13 years from four surveillance sites across Kenya: Kilifi County Hospital, Tabitha Clinic Nairobi, Lwak Mission Hospital, and Siaya County Referral Hospital (children aged < 5 years only). Samples were screened for RVA using enzyme linked immunosorbent assay (ELISA) and VP7 and VP4 genes sequenced to infer genotypes.

Results

We genotyped 614 samples in pre-vaccine and 261 in post-vaccine introduction periods. During the pre-vaccine introduction period, the most frequent RVA genotypes were G1P [8] (45.8%), G8P [4] (15.8%), G9P [8] (13.2%), G2P [4] (7.0%) and G3P [6] (3.1%). In the post-vaccine introduction period, the most frequent genotypes were G1P [8] (52.1%), G2P [4] (20.7%) and G3P [8] (16.1%). Predominant genotypes varied by year and site in both pre and post-vaccine periods. Temporal genotype patterns showed an increase in prevalence of vaccine heterotypic genotypes, such as the commonly DS-1-like G2P [4] (7.0 to 20.7%, P < .001) and G3P [8] (1.3 to 16.1%, P < .001) genotypes in the post-vaccine introduction period. Additionally, we observed a decline in prevalence of genotypes G8P [4] (15.8 to 0.4%, P < .001) and G9P [8] (13.2 to 5.4%, P < .001) in the post-vaccine introduction period. Phylogenetic analysis of genotype G1P [8], revealed circulation of strains of lineages G1-I, G1-II and P [8]-1, P [8]-III and P [8]-IV. Considerable genetic diversity was observed between the pre and post-vaccine strains, evidenced by distinct clusters.

Conclusion

Genotype prevalence varied from before to after vaccine introduction. Such observations emphasize the need for long-term surveillance to monitor vaccine impact. These changes may represent natural secular variation or possible immuno-epidemiological changes arising from the introduction of the vaccine. Full genome sequencing could provide insights into post-vaccine evolutionary pressures and antigenic diversity.
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Literature
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go back to reference Iturriza-gómara M, Green J, Brown DWG, Desselberger U, Gray JJ, Green JON, et al. Diversity within the VP4 gene of rotavirus P [8] strains : implications for reverse transcription-PCR genotyping. J Clin Microbiol. 2000;38(2):1–5 Available from: https://jcm.asm.org/content/38/2/898. Iturriza-gómara M, Green J, Brown DWG, Desselberger U, Gray JJ, Green JON, et al. Diversity within the VP4 gene of rotavirus P [8] strains : implications for reverse transcription-PCR genotyping. J Clin Microbiol. 2000;38(2):1–5 Available from: https://​jcm.​asm.​org/​content/​38/​2/​898.
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go back to reference Mukaratirwa A, Berejena C, Nziramasanga P, Ticklay I, Gonah A, Nathoo K, et al. Distribution of rotavirus genotypes associated with acute diarrhoea in Zimbabwean children less than five years old before and after rotavirus vaccine introduction. Vaccine. 2018; Available from. https://doi.org/10.1016/j.vaccine.2018.03.069. Mukaratirwa A, Berejena C, Nziramasanga P, Ticklay I, Gonah A, Nathoo K, et al. Distribution of rotavirus genotypes associated with acute diarrhoea in Zimbabwean children less than five years old before and after rotavirus vaccine introduction. Vaccine. 2018; Available from. https://​doi.​org/​10.​1016/​j.​vaccine.​2018.​03.​069.
Metadata
Title
Rotavirus group A genotype circulation patterns across Kenya before and after nationwide vaccine introduction, 2010–2018
Authors
Mike J. Mwanga
Betty E. Owor
John B. Ochieng
Mwanajuma H. Ngama
Billy Ogwel
Clayton Onyango
Jane Juma
Regina Njeru
Elijah Gicheru
Grieven P. Otieno
Sammy Khagayi
Charles N. Agoti
Godfrey M. Bigogo
Richard Omore
O. Yaw Addo
Seheri Mapaseka
Jacqueline E. Tate
Umesh D. Parashar
Elizabeth Hunsperger
Jennifer R. Verani
Robert F. Breiman
D. James Nokes
Publication date
01-12-2020
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2020
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/s12879-020-05230-0

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