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Seta SetaPrevalence of Delta variant and emergence of Omicron raises alert level again at a time when cases and deaths had begun to abate in Brazil
Data August and September, 2021

Prevalence of Delta variant and emergence of Omicron raises alert level again at a time when cases and deaths had begun to abate in Brazil

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.

August, 2021

September, 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 fourth report, we offer data from the complete sequencing of 2,624 samples collected in the first half of August (1,240 samples) and in September (1,384 samples) from Dasa patients with positive RT-PCR for SARS-CoV-2.

The release of the report, amid the emergence of the Omicron variant in November/21 and the identification of the first cases of the Mu variant, reiterates the important role of genomic surveillance. Twenty (20) Brazilian states had at least one (1) sample sequenced, with no samples from Amazonas, Acre, Roraima and Rondônia.

The analysis of the genomes, with epidemiological information and clinical and laboratory data, produces new knowledge that is essential in fighting Covid-19 in Brazil and worldwide. The main findings of the research are shown below.

Insights

1The report points to a progressive replacement of the Gamma variant and its Delta derivatives, with almost 50% of each in August 2021. By September 2021, Delta accounted for more than 95% of cases, prevailing in all regions of the country.

2A diversification in the Delta lineages has also been detected, including two possible sub-lineages of national origin, initially described by the genomic surveillance programme of the Butantan Inst. (São Paulo, SP) and also detected by GENOV.

3Prevalence of the Delta variant: as compared to the results of July 2021, when 121 of the 956 sequenced samples included the Delta variant, in August 2021, 761 of the 1,240 sequenced samples corresponded to Delta and in September 2021, 1,318 of the 1,384 sequences generated were classified as Delta.

4The report also identified the first cases of the Mu variant. In addition, the emergence of the Omicron variant in November 2021 underlines the importance of genomic surveillance.

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To read the 4st Genov Report in full, click here

Read all reports click here