| 1. |
- Ayukekbong, James A., et al.
(författare)
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Monitoring of seasonality of norovirus and other enteric viruses in Cameroon by real-time PCR : an exploratory study
- 2014
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Ingår i: Epidemiology and Infection. - : Cambridge University Press. - 0950-2688 .- 1469-4409. ; 142:7, s. 1393-1402
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Tidskriftsartikel (refereegranskat)abstract
- We studied the seasonal fluctuation of norovirus and other enteric viruses in Cameroon. Two hundred participants aged between 1 and 69 years were prospectively followed up. Each participant provided monthly faecal samples over a 12-month period. A total of 2484 samples were tested using multiplex real-time PCR assay for the detection of norovirus, rotavirus and enterovirus. The effect of weather variables and risk factors were analysed by Pearson correlation and bivariate analysis. Overall, enterovirus was the most commonly detected virus (216% of specimens), followed by norovirus (39%) and rotavirus (04%). Norovirus and enterovirus were detected throughout the year with a peak of norovirus detection at the beginning of the rainy season and a significant alternation of circulation of norovirus genogroups from one month to the next. Age <5 years and consumption of tap water were risk factors for norovirus infection. Better understanding of factors influencing transmission and seasonality may provide insights into the relationship between physical environment and risk of infection for these viruses.
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| 2. |
- Ayukekbong, James, et al.
(författare)
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Molecular Analysis of Enterovirus in Cameroon by Partial 50UTR-VP4 Gene Sequencing Reveals a High Genetic Diversity and Frequency of Infections
- 2014
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Ingår i: Journal of Medical Virology. - : Wiley. - 0146-6615. ; 86:12, s. 2092-2101
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Tidskriftsartikel (refereegranskat)abstract
- Enteroviruses (EVs) often infect humans, presenting as endemic or epidemic infections. In this study, the diversity of infecting EVs was studied among 146 children and 137 adults in a small community in Cameroon. The participants provided 2,458 fecal samples during 1-year monthly collection; 10 or more samples were obtained from 55%. Partial 5UTR-VP4 region could be sequenced in 393/547 PCR positive samples obtained from 119 children and 85 adults. EV-RNA was detected in at least one sample from 235 participants (83%) during the study period. A total of 121 different strains were identified, 66 infected only children, 29 only adults, and 26 infected both children and adults. There were children with up to five episodes with different strains, and adults with up to four such episodes. Infants aged <5 years were significantly more often EV infected compared to older participants. Infections with species EV-C constituted two third of all cases, and overall EV infections were more common during the rainy season. Species EV-B more often infected children than adults. Most strains were detected only for certain months of the year; however five strains were observed during the time spans of 5-10 months. Two strains were excreted up to eight months in three children and one adult. In 11 of the 128 families with paired samples the child and the adult were infected simultaneously by the same strain, indicating common source of infection. The study revealed a surprising complexity of EV ecosystem in a single community. J. Med. Virol. 86:2092-2101, 2014. (c) 2014 Wiley Periodicals, Inc.
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| 3. |
- Ayukekbong, James, et al.
(författare)
-
Monitoring of seasonality of norovirus and other enteric viruses in Cameroon by real-time PCR: an exploratory study
- 2014
-
Ingår i: Epidemiology and Infection. - : Cambridge University Press (CUP). - 0950-2688 .- 1469-4409. ; 142:7, s. 1393-1402
-
Tidskriftsartikel (refereegranskat)abstract
- We studied the seasonal fluctuation of norovirus and other enteric viruses in Cameroon. Two hundred participants aged between 1 and 69 years were prospectively followed up. Each participant provided monthly faecal samples over a 12-month period. A total of 2484 samples were tested using multiplex real-time PCR assay for the detection of norovirus, rotavirus and enterovirus. The effect of weather variables and risk factors were analysed by Pearson correlation and bivariate analysis. Overall, enterovirus was the most commonly detected virus (216% of specimens), followed by norovirus (39%) and rotavirus (04%). Norovirus and enterovirus were detected throughout the year with a peak of norovirus detection at the beginning of the rainy season and a significant alternation of circulation of norovirus genogroups from one month to the next. Age <5 years and consumption of tap water were risk factors for norovirus infection. Better understanding of factors influencing transmission and seasonality may provide insights into the relationship between physical environment and risk of infection for these viruses.
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| 4. |
- Ayukekbong, James, et al.
(författare)
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Pattern of Circulation of Norovirus GII Strains during Natural Infection
- 2014
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Ingår i: Journal of Clinical Microbiology. - : American Society for Microbiology. - 0095-1137 .- 1098-660X. ; 52:12, s. 4253-4259
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Tidskriftsartikel (refereegranskat)abstract
- Norovirus (NoV) is considered a major cause of nonbacterial gastroenteritis among people of all ages worldwide, but the natural course of infection is incompletely known. In this study, the pattern of circulation of NoVs was studied among 146 children and 137 adults in a small community in southwestern Cameroon. The participants provided monthly fecal samples during a year. NoV RNA was detected in at least one sample from 82 (29%) of the participants. The partial VP1 region could be sequenced in 36 NoV GII-positive samples. Three different genotypes were identified (GII.1, GII.4, and GII.17), with each genotype circulating within 2 to 3 months and reappearing after a relapse period of 2 to 3 months. Most infections occurred once, and 2 episodes at most within a year were detected. No difference in the frequency of NoV infection between children and adults was recorded. The same genotype was detected for a maximum of 2 consecutive months in 3 children only, suggesting that a less than 30-day duration of viral shedding in natural infection was common. Reinfection within a year with the same genotype was not observed, consistent with short-term homotypic immune protection. The study revealed that NoV strains are circulating with a limited duration of viral shedding both in the individuals and the population as part of their natural infection. The results also provide evidence of cross-protective immunity of limited duration between genotypes of the same genogroup.
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| 5. |
- Ayukekbong, James, et al.
(författare)
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Shift of Enterovirus species among children in Cameroon - Identification of a new enterovirus, EV-A119
- 2013
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Ingår i: Journal of Clinical Virology. - : Elsevier BV. - 1386-6532. ; 58:1, s. 227-232
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Tidskriftsartikel (refereegranskat)abstract
- Background: Infections caused by human enteroviruses (EVs) are often asymptomatic or mild, although they may cause more severe illnesses as meningitis and acute flaccid paralysis. EVs have globally posed a threat to children, and outbreaks of aseptic meningitis and hand, foot and mouth disease are frequently reported. Objective: To identify EV strains circulating among healthy children in a small community in Limbe, Cameroon two years apart. Study design: Species and EV types were obtained by partial 5'UTR-VP4 and VP1 sequencing of RNA from stool samples collected in October 2009 and September 2011 from 150 children in Cameroon. Results: In all, 74 children (49%) were infected with 28 different types of EV. There were 29 (54%) infected children in 2009, and 45 (47%) in 2011. There was a significant difference between detected species of EV, with 15 (47%) children infected with EV-A in 2009, and 22 (71%) with EV-B in 2011 (p = 0.0001). In 2009, one child was infected by a divergent EV, which was most similar to EV-A90. Based on the complete VP1 sequence, it was shown to be a new EV designated EV-A119. Conclusion: The current study shows a high heterogeneity of circulating EV types among children in Limbe, Cameroon, and a previously not described shift in predominating EV species. (C) 2013 Elsevier B. V. All rights reserved.
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| 6. |
- Sielinou, C. B. K., et al.
(författare)
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Knowledge, attitudes and perceptions regarding malaria: a cross-sectional study in pregnant women attending antenatal care in the New-Bell district hospital, Douala, Cameroon
- 2020
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Ingår i: Pan African Medical Journal. - : Pan African Medical Journal. - 1937-8688. ; 36
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: malaria remains a major public health problem in Cameroon. For a successful malaria control, there is a need to evaluate the level of awareness, attitude and perception of people living in malaria endemic areas such as the swampy littoral region of Cameroon. Methods: this was a descriptive cross-sectional study targeting pregnant women attending ANC in the New-Bell District Hospital. Data was collected with a semistructured questionnaire on demographic characteristics as well as knowledge, attitudes and practices regarding malaria. Results: two hundred and six pregnant women were enrolled in the study, all of them had heard on malaria in the past, with hospitals and television been the most known information dissemination channels. Only 60.2% of them own and used a LLINs with only 51.6% of owners treating the net. Conclusion: respondents with no education had poor knowledge on malaria. There is a need to improve education on malaria with active participation of women and improve malaria surveillance that will lead to malaria eradication.
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