Health officials and medical societies across the United States are urging adults and children to receive their seasonal immunizations by the end of October as respiratory illness season arrives with new vaccine formulations and expanded choices.
Fall temperatures have settled in across the country, bringing typical seasonal sniffles alongside the circulation of influenza, COVID-19, and respiratory syncytial virus, commonly known as RSV. While national metrics show overall seasonal flu activity remains low, health officials note that certain regions are already seeing rising numbers.
In Washington state, health officials in King County reported an increase in emergency department visits for the flu since mid-August. Meanwhile, the Florida Department of Health stated that the state’s flu positivity rate increased relative to the previous three-week average as of Sept. 19. In El Paso County, preliminary data from the El Paso County Public Health Department showed that flu hospitalizations reached a high of 872 cases in 2025, marking a large increase from the previous high of 527 cases recorded in 2022.
Medical professionals emphasize that early autumn is the prime window to build immunity before winter surges take hold. Because antibodies take approximately two weeks after vaccination to develop in the body, getting vaccinated early helps ensure protection before widespread community transmission begins.
Timing Your Vaccination
Physicians generally recommend scheduling annual flu shots between September and October. Dr. Scott Braunstein, chief medical officer at Sollis Health, points out that timing matters because protection does not take effect immediately, yet getting vaccinated too early in the summer can cause immunity to wane before the season concludes.
Dr. Amy Lynn Valentine, a CVS pharmacist and district leader, notes that while September and October are ideal, it is not too late to get vaccinated later in the season as long as viruses continue to circulate.
While the end of October serves as a primary target, physicians stress that the deadline is not absolute. Individuals who miss the autumn window can still benefit from getting vaccinated in November or later, as flu viruses frequently circulate well into the springtime months. Specific groups face different scheduling considerations. Dr. David Cutler advises on special populations such as older adults, healthcare personnel, and pregnant women.
New Formulations For 2026
Americans encounter a wider array of vaccine choices this season compared to prior years.
For individuals preferring traditional options, all standard U.S. flu vaccines for the 2026–2027 season are trivalent. These formulations are designed to protect against three distinct influenza viruses: an A(H1N1) virus, an A(H3N2) virus, and a B/Victoria lineage virus. Health authorities note that last season’s intense winter wave was driven in part by a novel strain known as Subclade K, which emerged after vaccine strains had already been selected. This year’s updated shots include specific coverage against that circulating strain.
High-Risk Groups
Federal health guidance advises that everyone aged 6 months and older should receive an annual flu vaccine with rare exceptions.
- Adults aged 65 and older, whose immune systems naturally slow down over time
- Young children, particularly those under age 5
- Pregnant women
- Individuals with underlying chronic health conditions such as heart disease, diabetes, asthma, kidney disease, or compromised immune systems
For older adults, the Centers for Disease Control and Prevention specifically recommends high-dose, adjuvanted, or recombinant options such as Fluzone High-Dose, Fluad, or Flublok. However, health experts emphasize that if those specific formulations are unavailable, individuals should accept whichever age-appropriate vaccine is immediately on hand rather than delaying protection.
Independent reviews published in medical journals have helped inform seasonal recommendations released by prominent professional organizations, including the American Academy of Pediatrics, the American Academy of Family Physicians, the American College of Obstetricians and Gynecologists, and the Infectious Diseases Society of America. Pediatric and family practice leaders stress that routine immunization programs remain vital for ensuring that families maintain access to preventative care, with many insurance plans, Medicare Part D, and Medicaid offering shots with no out-of-pocket costs.
Hygiene And Prevention Steps
Medical professionals emphasize that immunization works best when paired with everyday hygiene practices. Dr. Chris Lombardozzi, senior vice president and chief medical officer for Spartanburg Regional Healthcare System, notes that while vaccines do not eliminate all infections, they prime the immune system to fight off viruses, thereby lowering the risk of severe illness, missed work or school, and hospitalizations.
“Vaccination, hand hygiene, good sleep, cleaner indoor air, and staying home when you’re sick are much more useful than chasing the latest ‘immune-boosting’ trend.”
Medical experts, via USA TODAY 10BEST
Doctors also caution against relying heavily on over-the-counter vitamins or unverified preventive tonics. Vania Carter-Strauss, Director of Latinx Nursing Advocacy and Advancement at the University of Nevada, Reno, notes that there is little evidence supporting regular vitamin use for preventing respiratory illnesses. Instead, health providers recommend keeping simple wellness tools ready at home, such as practicing routine handwashing, avoiding touching the face, staying hydrated, eating a balanced diet, and using appropriate over-the-counter medications like ibuprofen, acetaminophen, or cough medicine to manage symptoms when directed by a clinician. Anyone experiencing severe symptoms, high-risk conditions, or persistent health issues that fail to improve after several days is advised to consult a primary care provider, visit local urgent care facilities, or contact health connections services for professional medical advice.
Retail pharmacies like CVS, Walgreens, Walmart, and Publix offer scheduled or walk-in appointments for individuals seeking annual immunizations.
Readers should consult qualified healthcare professionals, pharmacists, or local health agencies regarding personal health status, specific vaccine formulations, and individual medical needs.
In Colorado, data from the Colorado Department of Public Health and Environment recorded a record-setting 1,169 flu-related hospitalizations among children under age 18 during the 2025–2026 season, alongside eight pediatric deaths.
Dr. Marvin Lee, chief medical officer for CommonSpirit St. Francis Hospitals, and Dr. Michelle Barron, senior medical director of infection prevention and control at UCHealth, both emphasize that vaccination remains a critical tool in preventing severe illness, keeping individuals healthy, and protecting vulnerable populations such as cancer patients who face higher risks of severe outcomes.
For individuals in Indianapolis, Eskenazi Health offers walk-in flu vaccinations for those aged 11 and older at pharmacy locations, while established patients over 6 months old can schedule appointments through Eskenazi Health Center, MyChart, or by calling Eskenazi Health Connections.