Title | Genotyping of enteroviruses isolated in Kenya from pediatric patients using partial VP1 region. | ||
Author | Opanda, Silvanos M; Wamunyokoli, Fred; Khamadi, Samoel; Coldren, Rodney; Bulimo, Wallace D | ||
Journal | Springerplus | Publication Year/Month | 2016 |
PMID | 27026855 | PMCID | PMC4766141 |
Affiliation + expend | 1.Department of Emerging Infectious Diseases (DEID), United States Army Medical Research Directorate-Kenya, P.O. Box 606-00621, Nairobi, Kenya ; College of Health Sciences (COHES), Jomo Kenyatta University of Agriculture and Technology (JKUAT), Nairobi, Kenya. |
Enteroviruses (EV) are responsible for a wide range of clinical diseases in humans. Though studied broadly in several regions of the world, the genetic diversity of human enteroviruses (HEV) circulating in the sub-Saharan Africa remains under-documented. In the current study, we molecularly typed 61 HEV strains isolated in Kenya between 2008 and 2011 targeting the 3\'-end of the VP1 gene. Viral RNA was extracted from the archived isolates and part of the VP1 gene amplified by RT-PCR, followed by sequence analysis. Twenty-two different EV types were detected. Majority (72.0 %) of these belonged to Enterovirus B species followed by Enterovirus D (21.3 %) and Enterovirus A (6.5 %). The most frequently detected types were Enterovirus-D68 (EV-D68), followed by Coxsackievirus B2 (CV-B2), CV-B1, CV-B4 and CV-B3. Phylogenetic analyses of these viruses revealed that Kenyan CV-B1 isolates were segregated among sequences of global CV-B1 strains. Conversely, the Kenyan CV-B2, CV-B3, CV-B4 and EV-D68 strains generally grouped together with those detected from other countries. Notably, the Kenyan EV-D68 strains largely clustered with sequences of global strains obtained between 2008 and 2010 than those circulating in recent years. Overall, our results indicate that HEV strains belonging to Enterovirus D and Enterovirus B species pre-dominantly circulated and played a significant role in pediatric respiratory infection in Kenya, during the study period. The Kenyan CV-B1 strains were genetically divergent from those circulating in other countries. Phylogenetic clustering of Kenyan EV-D68 strains with sequences of global strains circulating between 2008 and 2010 than those obtained in recent years suggests a high genomic variability associated with the surface protein encoding VP1 gene in these enteroviruses.
StrainID | RV Species | Serotype | Length(nt) | Country | Year | Strain Name |
---|---|---|---|---|---|---|
UNS04541 | Unclassified | None | 338 | Kenya | 2009 | HRV_101_009 |
UNS04542 | Unclassified | None | 352 | Kenya | 2010 | HRV_118_010 |
UNS04543 | Unclassified | None | 352 | Kenya | 2010 | HRV_119-010 |
UNS04544 | Unclassified | None | 320 | Kenya | 2010 | HRV_120_010 |
UNS04545 | Unclassified | None | 349 | Kenya | 2010 | HRV_130_010 |
UNS04546 | Unclassified | None | 332 | Kenya | 2010 | HRV_135_010 |
UNS04547 | Unclassified | None | 332 | Kenya | 2010 | HRV_136_010 |
UNS04548 | Unclassified | None | 352 | Kenya | 2010 | HRV_143_010 |
UNS04549 | Unclassified | None | 347 | Kenya | 2010 | HRV_149_010 |
UNS04550 | Unclassified | None | 343 | Kenya | 2008 | HRV_028_008 |
UNS04551 | Unclassified | None | 338 | Kenya | 2008 | HRV_033_008 |
UNS04552 | Unclassified | None | 335 | Kenya | 2011 | HRV_197_011 |
UNS04553 | Unclassified | None | 347 | Kenya | 2010 | HRV_142_010 |
UNS04554 | Unclassified | None | 338 | Kenya | 2008 | HRV_025_008 |
UNS04555 | Unclassified | None | 338 | Kenya | 2008 | HRV_061_008 |
UNS04556 | Unclassified | None | 344 | Kenya | 2010 | HRV_125_010 |
UNS04557 | Unclassified | None | 317 | Kenya | 2011 | HRV_182_011 |
UNS04558 | Unclassified | None | 317 | Kenya | 2010 | HRV_161_010 |
UNS04559 | Unclassified | None | 337 | Kenya | 2008 | HRV_015_008 |
UNS04560 | Unclassified | None | 310 | Kenya | 2008 | HRV_080_008 |
UNS04561 | Unclassified | None | 316 | Kenya | 2011 | HRV_178_011 |
UNS04562 | Unclassified | None | 335 | Kenya | 2010 | HRV_127_010 |
UNS04563 | Unclassified | None | 332 | Kenya | 2010 | HRV_122_010 |
UNS04564 | Unclassified | None | 332 | Kenya | 2010 | HRV_121_010 |