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Seta SetaDelta variant prevails in all regions of the country and represents 99% of the samples
Data October and November, 2021

Delta variant prevails in all regions of the country and represents 99% of the samples

The emergence of the Omicron variant and the identification of the Mu variant add uncertainty to the future of the pandemic. The numbers of cases and deaths have been falling in Brazil in contrast to the upsurge in much of Europe.

The most recent updates about the presence of SARS-CoV-2 in Brazil’s five regions can be monitored in real time on this maps. The data is the result of scientific research by Genov, Dasa’s genome surveillance project, open to the public and aimed at monitoring COVID-19 in Brazil.

October, 2021

November, 2021

The chart bar bellow shows the behavior of the variants by state. In a left to right seeing, a timeline for the months since the beginning of the Genov project.

Context

In this fifth report, we offer data from the complete sequencing of 2,936 samples collected in the first half of October (1,487 samples) and in the first half of November 2021 (1,449 samples) from Dasa patients with positive RT-PCR for SARS-CoV-2. Twenty-four (24) Brazilian states had at least one (1) sample sequenced, with no samples from Amapá, Acre and Roraima.

The analysis of the data in the October and November period, with the homogeneous behaviour of the viral epidemiology in Brazil, has enabled us to identify the process of diversification and competition of the strains derived from Delta, through multiple introductions of new strains as well as through the emergence of derived strains in Brazil.

The release of the report, amid a new surge in cases in Brazil, reaffirms the vital role of genomic surveillance.

Insights

1The process of replacement of VOC Gamma for Delta, which started in August/21 and progressed in September/21, consolidated itself in the months of October and November: when the Delta variant and its derivatives were found in more than 99% of the samples and prevailed in all regions of the country.

2The months of October and November 2021 represented the time of lowest incidence of new cases in Brazil and other South American countries since the beginning of the pandemic. This trajectory of Delta is different from what happened in Europe and the United States, where it caused a significant increase in number of cases. The reason for this difference still requires an explanation on an experimental basis.

3The process of diversification and competition of the lineages derived from Delta is identified by observing the data, with a homogeneous behaviour of the viral epidemiology in Brazil. This occurs in two ways: Through multiple introductions of new strains and also through the emergence of derivatives (such as the AY.43.1, AY.43.2 strains) and probably the predominant AY.99.2 (with the decline in frequency of the B.1.617.2 ancestral strain).

4In the Southeast region, excluding the city of São Paulo and Rio de Janeiro, all analysed samples were classified as Delta. Only one sample in the city of São Paulo and another sample in the city of Rio de Janeiro were not Delta.

5The North region showed the lowest frequency of Delta among the samples analysed (80%), followed by the Northeast region (97%), the Midwest region (99%), the South region (99.3%), the cities of São Paulo and Rio de Janeiro (99.6%) and the Southeast region (100%).

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To read the 5st Genov Report in full, click here

Read all reports click here