The evolving SARS-CoV-2 epidemic in Africa: Insights from rapidly expanding genomic surveillance

INTRODUCTION Investment in Africa over the past year with regard to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) sequencing has led to a massive increase in the number of sequences, which, to date, exceeds 100,000 sequences generated to track the pandemic on the continent. These sequences have profoundly affected how public health officials in Africa have navigated the COVID-19 pandemic. RATIONALE We demonstrate how the first 100,000 SARS-CoV-2 sequences from Africa have helped monitor the epidemic on the continent, how genomic surveillance expanded over the course of the pandemic, and how we adapted our sequencing methods to deal with an evolving virus. Finally, we also examine how viral lineages have spread across the continent in a phylogeographic framework to gain insights into the underlying temporal and spatial transmission dynamics for several variants of concern (VOCs). RESULTS Our results indicate that the number of countries in Africa that can sequence the virus within their own borders is growing and that this is coupled with a shorter turnaround time from the time of sampling to sequence submission. Ongoing evolution necessitated the continual updating of primer sets, and, as a result, eight primer sets were designed in tandem with viral evolution and used to ensure effective sequencing of the virus. The pandemic unfolded through multiple waves of infection that were each driven by distinct genetic lineages, with B.1-like ancestral strains associated with the first pandemic wave of infections in 2020. Successive waves on the continent were fueled by different VOCs, with Alpha and Beta cocirculating in distinct spatial patterns during the second wave and Delta and Omicron affecting the whole continent during the third and fourth waves, respectively. Phylogeographic reconstruction points toward distinct differences in viral importation and exportation patterns associated with the Alpha, Beta, Delta, and Omicron variants and subvariants, when considering both Africa versus the rest of the world and viral dissemination within the continent. Our epidemiological and phylogenetic inferences therefore underscore the heterogeneous nature of the pandemic on the continent and highlight key insights and challenges, for instance, recognizing the limitations of low testing proportions. We also highlight the early warning capacity that genomic surveillance in Africa has had for the rest of the world with the detection of new lineages and variants, the most recent being the characterization of various Omicron subvariants. CONCLUSION Sustained investment for diagnostics and genomic surveillance in Africa is needed as the virus continues to evolve. This is important not only to help combat SARS-CoV-2 on the continent but also because it can be used as a platform to help address the many emerging and reemerging infectious disease threats in Africa. In particular, capacity building for local sequencing within countries or within the continent should be prioritized because this is generally associated with shorter turnaround times, providing the most benefit to local public health authorities tasked with pandemic response and mitigation and allowing for the fastest reaction to localized outbreaks. These investments are crucial for pandemic preparedness and response and will serve the health of the continent well into the 21st century

The Prevalence of Oral Habits Among 4 to 15 year Old School Children in Lagos

Objective: To provide information regarding the prevalence of oral habits among a group of Nigerian children. Study Design: This is cross-sectional study of 928 children, 431 males and 497 females aged 4 to 15 years from both rural and urban areas of Lagos State in Nigeria. Habits assessed included digit, lip and tongue habits. Results: Thirty four point one per cent of the children examined presented with an oral habit. Of these, digit sucking was the most frequently occurring, seen in 50% of the children with oral habits. Tongue and lip habits occurred in 27% and 23% of children respectively. There was observed a steady decrease in oral habits with an increase in age. The prevalence being highest among 4 to 5 year olds (44.2%) and gradually decreasing to 11.8% among the 14 to 15 year age group. Oral habits were found to be slightly more common among males than females, though this finding was not significant. Socio-economic status (SES) was found to have a significant effect on the occurrence of oral habits. Forty eight per cent of all children of high SES engaged in an oral habit, whereas this was observed in only 24.4% of all children of low SES. Conclusion: The findings of this study indicate that there is an increased prevalence of oral habits among children in the population in recent times. The occurrence of these habits is more frequently seen in children from families of high socio-economic status. . Keywords:Epidemiology, prevalence, oral habits Nigerian Journal of Health and Biomedical Science Vol. 6 (1) 2007: pp. 78-8