Concerns Rise That New Sars-CoV-2 Variants Could Be at Play as Severe COVID-19 Cases Rises Across Brazil
Nikhil Prasad Fact checked by:Thailand Medical News Team Nov 13, 2026 16 minutes ago
Emerging increases in severe COVID-19 cases across several Brazilian states are raising concerns about renewed SARS-CoV-2 transmission and whether evolving viral variants could be contributing to the trend. However, health authorities have not established any connection between the rising hospitalizations and new variants.
Rising severe COVID-19 hospitalizations across Brazil raise questions about SARS-CoV-2 variant activity
Brazil's Oswaldo Cruz Foundation (Fiocruz), through its latest InfoGripe Bulletin released November 12, reported increasing numbers of severe acute respiratory infection (SARI) cases associated with COVID-19. The surveillance analysis covering November 1 to 7 nevertheless indicates that severe disease activity remains relatively low nationwide.
Multiple Brazilian States Report Rising Hospitalizations
According to Fiocruz, increases in COVID-19-related hospitalizations have emerged across several Central-South and Northeastern areas, including the Federal District, Minas Gerais, São Paulo, Rio de Janeiro, Paraná, and Bahia.
Meanwhile, Mato Grosso is showing signs of slowing growth, suggesting that respiratory disease trends differ geographically.
Although the surveillance findings raise questions about changing transmission patterns, this
Thailand Medical News report emphasizes that genomic sequencing evidence would be necessary to determine whether emerging SARS-CoV-2 variants are contributing to these increases.
No Nationwide Emergency Despite Warning Signs
Through epidemiological week 44, no Brazilian state simultaneously registered an elevated SARI alert or risk classification alongside increasing cases.
Roraima and Mato Grosso remained at alert levels but had not experienced increasing cases during the preceding six weeks.
Fiocruz researcher Tatiana Portella stressed that continued coronavirus circulation makes vaccination particularly important, especially among vulnerable populations requiring annual COVID-19 boosters.
COVID-19 Accounts for Significant Share of Respiratory Deaths
InfoGripe surveillance covering four epidemiological weeks identified rhinovirus in 49% of respiratory virus-positive cases, followed by SARS-CoV-2 at 11.5%, respiratory syncytial virus at 8.9%, influenza A at 4.3%, and influenza B at 3.9%.
Among deaths with identified respiratory viruses, rhinovirus represented 43.6%, SARS-CoV-2 accounted for 26.9%, influenza B contributed 10.3%, influenza A 7.7%, and RSV 2.6%.
These proportions reflect viral detections rather than confirmed virus-specific mortality rates.
Vigilance and Variant Surveillance Remain Crucial
Although Brazil is not experiencing a nationwide severe COVID-19 emergency, localized increases warrant closer epidemiological monitoring and genomic surveillance. Identifying circulating variants, maintaining vaccination coverage, and protecting vulnerable populations will be important for determining whether these
emerging trends represent temporary fluctuations or the beginning of a broader resurgence.
References:
https://fiocruz.br/noticia/2026/11/infogripe-aponta-aumento-do-numero-de-casos-de-covid-19
https://agencia.fiocruz.br/sites/agencia.fiocruz.br/files/Resumo_InfoGripe_2026_44-1.pdf
https://www.cnnbrasil.com.br/saude/casos-graves-de-covid-19-dao-sinal-de-crescimento-no-brasil-aponta-fiocruz/
Read Also:
https://www.thailandmedical.news/articles/coronavirus 
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