[Update information - Genomic surveillance of the state of Rio de Janeiro, Brazil, in the period between June, 22th, 2021 and July, 19th, 2021]
Since the last update, we have additionally sequenced 749 SARS-CoV-2 genomes from the state of Rio de Janeiro, Brazil, as part of the Genomic Surveillance Program of the Rede Corona-ômica-RJ project. The frequency of B.1.617.2 (Delta) has increased from 0,57% to 26,37% of samples in a month and is expected to replace P.1 (currently at 65,66%) as the dominant lineage in the near future. These new sequences were grouped within three different clades, suggesting a new introduction of B.1.617.2 in the country and the transmission from the state of Goiás to Rio de Janeiro (see the update on https://pando.tools/t/genomic-surveillance-tracks-the-first-communitary-outbreak-of-delta-b-1-617-2-variant-in-brazil/733). We have also detected the appearance of lineages P.1.7 (1,65%) and P.1.4 (0,82%) in Rio de Janeiro. Frequency of other lineages in the states were as follow: P.1.2 (2,75%), B.1.1.7 (1,10%), P.1.1 (0,82%), B.1.1 (0,27%), P.4 (0,27%) and P.5 (0,27%).
Figure 1. Relative frequency of SARS-CoV-2 lineages in Rio de Janeiro since fist detection in the state.