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Human metapneumovirus epidemiological and evolutionary patterns in Coastal Kenya, 2007-11
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Owor, Betty E., Masankwa, Geoffrey N., Mwango, Lilian C., Njeru, Regina W., Agoti, Charles N. and Nokes, D. James (2016) Human metapneumovirus epidemiological and evolutionary patterns in Coastal Kenya, 2007-11. BMC Infectious Diseases, 16 (1). doi:10.1186/s12879-016-1605-0
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Official URL: http://dx.doi.org/10.1186/s12879-016-1605-0
Abstract
Background:
Human metapneumovirus (HMPV) is an important global cause of severe acute respiratory infections in young children and the elderly. The epidemiology of HMPV in sub-Saharan Africa is poorly described and factors that allow its recurrent epidemics in communities not understood.
Methods:
We undertook paediatric inpatient surveillance for HMPV in Kilifi County Hospital (KCH) of Coastal Kenya between 2007 and 2011. Nasopharyngeal samples collected from children aged 1 day–59 months admitted with severe or very severe pneumonia, were tested for HMPV using real-time polymerase chain reaction (RT-PCR). Partial nucleotide sequences of the attachment (G) and fusion (F) surface proteins of positive samples were determined and phylogenetically analyzed.
Results:
HMPV was detected in 4.8 % (160/3320) of children [73.8 % (118/160) of these less than one year of age], ranging between 2.9 and 8.8 % each year over the 5 years of study. HMPV infections were seasonal in occurrence, with cases predominant in the months of November through April. These months frequently coincided with low rainfall, high temperature and low relative humidity in the location. Phylogenetic analysis of partial F and G sequences revealed three subgroups of HMPV, A2 (74 %, 91/123), B1 (3.2 %, 4/123) and B2 (22.8 %, 28/123) in circulation, with subgroup A2 predominant in majority of the epidemic seasons. Comparison of G sequences (local and global) provided a greater phylogenetic resolution over comparison of F sequences and indicated presence of probable multiple G antigenic variants within the subgroups due to differences in amino acid sequence, encoded protein length and glycosylation patterns.
Conclusion:
The present study reveals HMPV is an important seasonal contributor to respiratory disease hospitalization in coastal Kenya, with an evolutionary pattern closely relating to that of respiratory syncytial virus.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | R Medicine > RC Internal medicine | ||||||||
| Divisions: | Faculty of Science > Life Sciences (2010- ) | ||||||||
| Library of Congress Subject Headings (LCSH): | Respiratory infections in children -- Prevention -- Kenya, Respiratory infections in old age, Epidemiology, Epidemics | ||||||||
| Journal or Publication Title: | BMC Infectious Diseases | ||||||||
| Publisher: | BioMed Central Ltd. | ||||||||
| ISSN: | 1471-2334 | ||||||||
| Official Date: | 17 June 2016 | ||||||||
| Dates: |
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| Date of first compliant deposit: | 23 June 2016 | ||||||||
| Volume: | 16 | ||||||||
| Number: | 1 | ||||||||
| DOI: | 10.1186/s12879-016-1605-0 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
| Funder: | Wellcome Trust (London, England) | ||||||||
| Grant number: | 084633, 102975, 077092 |
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