Four varieties circulate in Senegal while
In Senegal, the Institut Pasteur in Dakar notes a strong circulation of variants of Covid-19. Four have been identified among departing travelers in April and May. The alpha variant (known as "British") had already been discovered in the territory. From now on, Delta (known as "Indian"), Beta (known as "South African") and Nigerian variants are also circulating. The health service is asking for an…