Every state in Brazil now reports SRAG cases at levels that trigger official concern.
VSR, influenza A, and rhinovirus account for 94.8% of SRAG cases, with VSR at 48.5% prevalence across four epidemiological weeks. Fifteen Brazilian capitals face alert or high-risk status; influenza A causes severe illness in children under 2 and higher mortality in those 65+.
- Respiratory syncytial virus accounts for 48.5% of SRAG cases; influenza A 21.9%; rhinovirus 24.3%
- All 27 Brazilian states report alert-level or higher SRAG incidence; 18 show long-term growth trends
- Fifteen capital cities at alert or high-risk status: Aracaju, Belém, Belo Horizonte, Boa Vista, Brasília, Campo Grande, Curitiba, Florianópolis, Goiânia, João Pessoa, Macapá, Porto Alegre, Rio Branco, Rio de Janeiro, São Luís
- Influenza A causes severe illness primarily in children under 2 years; higher mortality in those 65+
Brazil's severe acute respiratory syndrome cases surge nationwide, driven by influenza A, respiratory syncytial virus, and rhinovirus. All states report alert-level incidence with 18 showing long-term growth trends.
Across Brazil, hospitals are filling with patients struggling to breathe. The latest weekly report from the Oswaldo Cruz Foundation, released this week, documents a sharp rise in cases of Severe Acute Respiratory Syndrome—known as SRAG—spreading through every corner of the country. Three viruses are driving the surge: the respiratory syncytial virus, influenza A, and rhinovirus, each taking hold in different populations and regions with relentless momentum.
Every state in Brazil now reports SRAG cases at levels that trigger official concern. Eighteen of them show something more alarming: the trend is not just high, it is climbing. These states stretch across the map—from Acre in the far north to Rio Grande do Sul in the south, from coastal Bahia to inland Goiás. The capitals of these states are among the hardest hit. Fifteen major cities now sit at alert status or higher: Aracaju, Belém, Belo Horizonte, Boa Vista, Brasília, Campo Grande, Curitiba, Florianópolis, Goiânia, João Pessoa, Macapá, Porto Alegre, Rio Branco, Rio de Janeiro, and São Luís.
The respiratory syncytial virus has become the dominant threat. In the four weeks measured by the foundation's surveillance system, it accounts for nearly half of all SRAG cases—48.5 percent. Influenza A follows at 21.9 percent, rhinovirus at 24.3 percent, and influenza B at 5.1 percent. Together, these three viruses explain more than 94 percent of the surge. The geographic spread is uneven but comprehensive. VSR cases are climbing in the North, Northeast, Southeast, and South regions. In some places where the virus seemed to be retreating—Espírito Santo, Mato Grosso, Goiás, the Federal District, and Paraíba—circulation remains stubbornly high.
Influenza A tells a different story by age. The virus hits hardest among the very young: children under two years old face the highest rates of severe illness. But when it comes to death, the pattern inverts. People aged 65 and older bear the heaviest burden of mortality. The virus is still spreading in the South, in São Paulo and Minas Gerais, and in scattered pockets across the North and Northeast. Rhinovirus, meanwhile, has emerged as a particular threat to children and adolescents, climbing in states from Alagoas to Santa Catarina.
Tatiana Portella, a researcher with the InfoGripe surveillance program, emphasizes that vaccination remains the single most effective tool against these viruses. She notes that the RSV vaccine, newly available, is administered to pregnant women starting at 28 weeks of gestation. The vaccine works by allowing mothers to produce antibodies that pass to the fetus, protecting newborns during their most vulnerable first six months of life. For influenza and other respiratory viruses, she stresses, people at highest risk must keep their vaccinations current.
Beyond the needle, prevention depends on behavior. Cover your mouth and nose when you cough or sneeze. Do not share personal items. Wash your hands often. Wear a mask if you have respiratory symptoms. Avoid close contact with others when you are sick. These measures sound simple, but they require discipline across a population of over 200 million people, many living in crowded conditions where the virus spreads with ease.
The data comes from the Epidemiological Surveillance Information System for Influenza, updated through May 30. It captures the picture as of epidemiological week 20—a snapshot of a moving crisis. COVID-19, by contrast, is fading. Cases associated with the coronavirus are declining across most of Brazil, though Ceará, Maranhão, and Pará still report growth. The pandemic that dominated headlines for years has receded, but the respiratory viruses that preceded it, and that will outlast it, are surging anew.
Notable Quotes
Vaccination continues to be the primary strategy for preventing severe cases and deaths caused by respiratory viruses, and at-risk populations must keep their immunizations current.— Tatiana Portella, InfoGripe researcher, Oswaldo Cruz Foundation
The RSV vaccine is administered to pregnant women starting at 28 weeks of gestation so they produce and transmit antibodies to the baby, protecting the infant during the first six months of life.— Tatiana Portella, InfoGripe researcher
The Hearth Conversation Another angle on the story
Why is the respiratory syncytial virus suddenly so dominant? Is this seasonal, or something new?
It's partly seasonal—RSV does peak in winter months in the Southern Hemisphere, and Brazil's winter is June through August. But the scale this year seems to be outpacing what we'd normally expect. The virus is circulating heavily even in places where it should be declining.
The data shows influenza A killing people over 65 while severely sickening babies under two. That's an unusual split. What explains that?
Age shapes immune response. Elderly people have weaker immune systems and existing health conditions that make severe infection more likely to be fatal. Babies have no prior exposure to influenza, so their bodies can't mount an effective defense. They get very sick, but they're also more likely to survive if they get care.
You mention the RSV vaccine for pregnant women. That's relatively new in Brazil, isn't it?
Yes. It's a recent addition to the immunization schedule. The idea is elegant—vaccinate the mother so she passes protection to the baby before birth. It's one of the few tools we have for protecting infants, who are too young to be vaccinated themselves.
Fifteen capital cities are in alert status. Does that mean the healthcare system is overwhelmed?
Alert status means cases are rising and hospitals are seeing sustained pressure. It doesn't necessarily mean collapse, but it signals that the system is strained and could tip into crisis if the trend continues.
What happens if people don't get vaccinated?
More hospitalizations, more deaths, especially among the vulnerable. The viruses will keep circulating, mutating, finding new hosts. Vaccination breaks that chain.
Is there any good news in this report?
COVID-19 is declining. That's real progress. And the fact that we're tracking this so closely, publishing weekly updates, means we can see the problem and respond. That's not guaranteed everywhere.