Flu Vaccine Shortage Reported in Most Health Centers in Passo Fundo

Public health clinics across Passo Fundo, a city of 220,000 in Brazil’s southern state of Rio Grande do Sul, have run out of influenza vaccine doses, leaving priority groups without access to free immunization as the region enters its annual flu season.

Vaccine Shortage Reported Across Municipal Health Centers

On Monday, April 27, 2026, the municipal health department confirmed that all 6,810 doses allocated to public health centers had been administered. No remaining stock was available at any of the city’s five Centros de Atenção Integral à Saúde (CAIS) or the central vaccination clinic, according to an official statement released at 11:30 a.m. Local time.

The shortage affects individuals in designated priority groups, including children aged six months to under six years, adults over 60, pregnant women, postpartum women, healthcare workers, educators, Indigenous communities, quilombola populations, individuals experiencing homelessness and people with chronic illnesses or disabilities. The city had initiated its vaccination campaign one week ahead of the national rollout, beginning on April 20, 2026.

New Shipment Expected, But Timing Remains Uncertain

Municipal health officials stated that a new shipment of vaccines is anticipated in the coming days, though no exact delivery date has been confirmed. In a separate announcement on April 23, 2026, the city received 18,700 additional doses, which were intended to replenish supplies. However, it remains unclear whether these doses have been distributed to vaccination sites or if they are still being processed for use.

Diego Farias, Passo Fundo’s municipal health secretary, told local media that the city is still awaiting technical guidance from state and federal health authorities regarding the 2025–2026 influenza vaccination campaign. This includes details on which priority groups will be included and which vaccine formulation will be provided through the public system. Until these instructions are received, the city cannot finalize its distribution plan.

Private Clinics Continue Offering Vaccines at a Cost

While public health centers remain without stock, private clinics and pharmacies in Passo Fundo continue to offer influenza vaccines for a fee. Prices range from R$79.90 for a trivalent vaccine to R$120 for a quadrivalent formulation, depending on the provider. The quadrivalent vaccine available in private clinics protects against four influenza strains: H1N1 Victoria, H3N2 Croatia, and two influenza B lineages (B Austria and B Phuket).

Health experts emphasize that annual vaccination is necessary due to the virus’s ability to mutate rapidly. The ideal time for immunization is before the onset of colder weather, as the body requires at least 15 days to develop sufficient antibody protection. Alessandra Dull, a pharmacist and owner of a local immunization clinic, noted that influenza viruses can circulate among mammals, birds, and swine, contributing to their genetic variability.

Influenza’s Public Health Impact in the Region

Passo Fundo has been a focal point for influenza research in Brazil, particularly following the 2009 H1N1 pandemic. A 2024 study published in Revista de Saúde Pública examined biological, social, and healthcare factors associated with influenza-related deaths during the 2009 outbreak. The research, conducted across 11 hospitals in four Brazilian cities—including Passo Fundo—identified shock and sepsis as the most common clinical complications among severe cases.

The study, led by epidemiologist José Ueleres Braga of the Rio de Janeiro State University and the Oswaldo Cruz Foundation, highlighted disparities in healthcare access and outcomes. While the research did not focus exclusively on Passo Fundo, its inclusion in the multi-city analysis underscores the city’s role in broader public health surveillance efforts.

National Policy Shift Expands Year-Round Vaccination Access

In 2025, Brazil’s Unified Health System (SUS) incorporated influenza vaccination into its permanent immunization schedule, moving away from a seasonal campaign model. This change ensures that priority groups—including young children, pregnant women, and older adults—can receive the vaccine throughout the year, rather than only during limited-time campaigns. The policy shift aims to improve coverage rates and reduce seasonal outbreaks.

However, the transition has also introduced logistical challenges, particularly in ensuring consistent vaccine supply across municipalities. Passo Fundo’s current shortage reflects broader tensions between expanded access and supply chain reliability.

What Comes Next for Passo Fundo’s Vaccination Efforts

Health officials have not provided a specific timeline for when vaccination services will resume at public clinics. Residents in priority groups are advised to monitor updates from the municipal health department or seek vaccination at private providers if they are able to pay out-of-pocket.

The situation in Passo Fundo highlights ongoing challenges in balancing vaccine demand, supply chain logistics, and public health priorities. As the city awaits further guidance from state and federal authorities, the temporary suspension of free vaccinations underscores the need for robust planning to prevent gaps in immunization coverage, particularly as influenza activity typically rises during the southern hemisphere’s autumn and winter months.