The Rio de Janeiro-based Oswaldo Cruz Foundation (Fiocruz) confirmed the presence in the southern part of the continent's largest country of a sublineage of the Sars-CoV-2 Omicron strain known as XEC, which is rapidly spreading worldwide, Agencia Brasil reported. The variant has been found in the States of Rio de Janeiro, São Paulo, and Santa Catarina after Fiocruz made the first discovery in samples from two patients in Rio last month.
