Seroprevalence of SARS-CoV-2 Antibodies and Associated Factors in Bamako, Mali: A Population-Based Cross-Sectional Study in September 2022.

BACKGROUND: The sero-epidemiological characteristics of SARS-CoV-2 infections in Mali are not yet well understood. This study assessed SARS-CoV-2 antibody seroprevalence and factors associated with antibody responses in the general population of Bamako, the capital city and epicenter of COVID-19, to assess the magnitude of the pandemic and contribute to control strategy improvements in Mali. METHODS: A cross-sectional survey was conducted in September 2022 to collect sociodemographic information, clinical characteristics, comorbid factors, and blood samples. ELISA was performed to determine anti-Spike (anti-S) and anti-RBD antibody levels. A total of 3601 participants were enrolled in REDCap. R-Studio was used for the statistical analysis. The chi-squared (χ2) test was used to compare the proportions across different groups. Logistic regression models were used to elucidate factors associated with antibody responses. RESULT: The sex ratio for female-to-male was 3.6:1. The most representative groups were the 20-29-year-olds (28.9%, n = 1043) and the 30-39-year-olds (26.9%, n = 967). The COVID-19 vaccine coverage among the participants was 35.8%, with vaccines from Covishield AstraZeneca (13.4%), Johnson & Johnson (16.7%), Sinovac (3.9%), and BioNTech Pfizer (1.8%). Overall, S protein and RBD antibody seroprevalences were remarkably high in the study population (98% and 97%, respectively). Factors such as youth (1-9 years old) and male sex were associated with lower SARS-CoV-2 antibody responses, whereas COVID-19 vaccinations were associated with increased antibody responses. CONCLUSION: This serosurvey demonstrated the high seroprevalence of SARS-CoV-2 antibodies and highlighted the factors influencing antibody responses, while clearly underlining an underestimation of the pandemic in Mali.

A population-based combination strategy to improve the cervical cancer screening coverage rate in Bamako, Mali.

INTRODUCTION: Cervical cancer screening coverage rate is <5% in Sub-Saharan Africa and <2% in French- speaking African countries. In 2016, we implemented strategies to improve cervical cancer screening in Bamako, the "Weekend70 program". The present study objectives are to determine the effect of this program on women's participation in cervical cancer screening in Bamako, and to estimate the cervical cancer screening coverage rate in Bamako. MATERIAL AND METHODS: From 1 January 2016 to 31 July 2020, we conducted an operational research by developing several strategies to improve the cervical cancer screening coverage rate among adolescents and women ≥15 years old in Bamako, Mali. The strategies consisted of awareness-raising activities, strengthening of screening practices in healthcare facilities and cost-free cervical cancer screening during the weekend. Descriptive statistics were presented. The cervical cancer coverage rate was calculated by dividing the number of women screened by the total number of women ≥20 years old, based on Mali demographic data. RESULTS: The total number of women screened was 289 924. Residents from Bamako represented 91.9% (266 436/289 924) vs 8.1% (23 488/289 924) who lived outside Bamako. The mean age was 33.2 (± 11.5) years old. Around 46.1% of participants attending the cervical cancer screening were between 30 and 49 years old (World Health Organization prioritized target age for cervical cancer screening). Women ≥60 years old represented <5%. Cervical cancer screening participation increased significantly, from <800 women screened per week before the implementation of the program to a peak of 4100 women screened per week during the "Weekend70 program". Overall, the cervical cancer screening coverage rates at the end of the study among women ≥20 years old was 47.3%, and 56.9% in the WHO target population. CONCLUSION: In an impoverished context, a multi-component strategy significantly increases cervical cancer screening participation.