Abstract
Abstract Objective : In a context of increasing cases despite vaccination campaigns, a survey was conducted in the Bangui population in January 17 to 26, 2022 to evaluate the strains of Severe Acute Respiratory Infection Coronavirus 2 (SARS-Cov-2) circulating in a healthy population by taking nasopharyngeal samples in 2,554 randomly selected volunteers. Antigen detection was performed systematically and RT-PCR was done on the positive samples. Thirty samples were found RT-PCR positive (1.2%) and sent for viral genome sequencing. Twenty eight SARS-Cov-2 strains belong to Omicron type and solely 2 to Delta type. Thus, infection were uncommon in the tested population but the presence of Omicron and Delta types make fear than vaccination will not be efficient to fight against the virus and newly designed vaccine should be implemented to better protect the population who is at risk of infection and re-infection by these variants.
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