Don't wait on flu-shot politics (2026)

Flu is quiet in the United States right now, but the week's clearest vaccine lesson came from a place where flu was not quiet at all: Joint Base San Antonio-Lackland reported 275 confirmed flu cases, four hospitalizations, and one trainee death under investigation after only 40% of new trainees were vaccinated when the outbreak began. 1 2

The practical takeaway for families is simple: do not let a policy fight become a reason to postpone ordinary vaccine planning. The CDC's Advisory Committee on Immunization Practices, or ACIP, had its June 24-26 meeting cancelled because of ongoing litigation, and that can complicate insurance coverage for newly approved vaccines. 3 But routine decisions still have enough evidence behind them: check measles immunity before travel, plan fall flu vaccination on schedule, and treat new mRNA flu-vaccine news as promising but not yet a reason to wait.

Flu is at its summer floor, but crowded settings can still burn fast

CDC FluView for Week 24, covering the week ending June 20 and published June 26, shows influenza-like illness at 1.1%, down from 1.2% in Week 23; clinical labs found influenza in 0.7% of respiratory specimens, or 139 positives among 21,035 tests. 4 CDC described seasonal influenza activity as low nationwide, and emergency-department visits with a flu discharge diagnosis were 0.1% nationally. 4

That low national number does not mean flu cannot spread quickly in a dorm, barracks, summer program, or other dense living environment. At Lackland, the Air Force restored flu-shot requirements for recruits on June 11, and the Army, Navy, and Air Force have been granted exceptions allowing flu shots to be required again for basic trainees. 5 6 Rep. Joaquin Castro said the outbreak was "getting worse" when his office reported 275 confirmed cases, and he called the April decision to end mandatory flu vaccination "reckless." 2 7

For families, that translates into a narrower rule than "flu is gone." If a teenager is headed to basic training, a sleepaway camp, a residential program, or a college dorm during flu season, vaccination timing matters because close-contact settings reduce the margin for delay. CDC also reported two newly recorded pediatric flu deaths in Week 24, bringing the 2025-26 season total to 184, with the new reports tied retrospectively to weeks ending January 17 and May 30. 4

Do not time the fall shot too precisely

A June review from the Public Health Agency of Canada in the Canada Communicable Disease Report looked at 49 studies on within-season waning and flu-shot timing, including 37 studies on waning and 12 on timing. 8 The review found that flu vaccine effectiveness is usually highest in the first 1-3 months after vaccination and then declines gradually, especially for A(H3N2) and adults older than 60. 8

The same review's family-relevant conclusion is the important part: "Evidence does not support substantial or consistent population-level benefits from delaying vaccination." 8 In plain English: waning is real, but trying to outguess the season can backfire if it causes missed appointments. Families should plan for fall vaccination when shots become available and household schedules make attendance reliable, rather than waiting for a perfect week.

ACIP's cancelled meeting affects coverage more than science

ACIP, the CDC advisory committee that usually turns FDA approvals into official US vaccine recommendations, had its June 24-26 meeting cancelled; the CDC meeting page says, "Due to ongoing litigation, this meeting is cancelled." 3 The March 18-19 ACIP meeting was also cancelled for litigation reasons, meaning ACIP has now lost two scheduled 2026 meetings. 3

The legal timeline is still moving. In AAP et al. v. Kennedy et al., the parties filed a joint status report on June 24, the First Circuit issued a scheduling order on June 25, and the next listed deadline is the plaintiffs' brief due July 16. 9 Andrew Racine, president of the American Academy of Pediatrics, said the federal government "has had and continues to have the power to restore a lawful ACIP and schedule a meeting at any time." 10

This matters because insurance coverage usually follows recommendations, not just FDA authorization. Immunize.org wrote this week that after a new licensed indication, clinical-use recommendations are typically made by ACIP and insurance coverage typically follows those recommendations; "In the absence of ACIP, the next steps for federal recommendations are not clear at this time." 11 That is the practical uncertainty families may feel at the pharmacy counter this fall.

Professional groups are trying to fill some of the gap. The American Academy of Pediatrics announced that it plans independent guidance for influenza in early August, RSV and COVID-19 in early September, HPV in December, and the 2027 child and adolescent immunization schedule in January 2027. 11 The SAVRR Council advised clinicians to keep using existing 2025-26 influenza, COVID-19, and RSV immunization recommendations until updated 2026-27 guidance from relevant medical associations is released. 11

The mRNA flu shot looks stronger, but it is not yet a fall plan

The FDA's Vaccines and Related Biological Products Advisory Committee, or VRBPAC, voted on June 18 that Moderna's mFlusiva, also called mRNA-1010, has benefits that outweigh risks for adults age 50 and older. 11 Trial summaries cited by Immunize.org report that mFlusiva showed better efficacy than standard-dose flu vaccine in adults 50 and older and better immunogenicity than high-dose flu vaccine in adults 65 and older; FDA's final decision is expected in early August. 11

Two new immunology papers help explain why scientists are interested in this platform. A Cell Reports study of 402 healthy participants ages 8-90 found that weaker flu-vaccine antibody responses in older adults were traced mainly to T follicular helper cells, or Tfh cells, failing to mature properly, rather than to B cells being intrinsically unable to respond. 12 Tfh cells help B cells make better antibodies, and the study identified age-related loss of mature CXCL13+ germinal-center Tfh cells along with reduced BACH2 and SOX4 regulatory factors. 12

A Nature Immunology brief on mRNA-1010 reported that the mRNA-based influenza vaccine expanded the breadth of the B-cell response in humans and produced broader antibody binding against antigenically diverse flu strains than the traditional comparator described in the study brief. 13 Put together, the two papers support a plausible reason mRNA flu vaccines could matter for older adults: if aging weakens one helper-cell pathway, vaccine designs that drive broader and longer B-cell responses may help. That is a scientific implication, not a personal recommendation yet.

Moderna did not issue a new MFLUSIVA press release during the June 22-29 window, and the known FDA decision date remains August 5. 14 Pfizer's public newsroom showed no flu or respiratory-vaccine pipeline announcement in the same window; its visible releases were a Q3 dividend notice, an IBRANCE oncology approval, and a Q2 earnings-call announcement. 15

Measles and HPV are the near-term family checks

CDC reported 2,134 confirmed US measles cases as of June 25, up 30 from the June 18 checkpoint of 2,104. 16 Cases were still reported from 41 jurisdictions, 30 outbreaks had been reported, 93% of cases were outbreak-associated, 92% of cases were in people who were unvaccinated or whose vaccination status was unknown, and CDC reported zero measles deaths in 2026. 16

Before summer travel, families should verify measles-mumps-rubella vaccination status rather than relying on memory. That advice is especially relevant for children, teenagers, and adults whose records are scattered across schools, pediatric practices, pharmacies, or old state registries. The case count is still rising, and the vaccination-status pattern shows that susceptibility remains concentrated among people who are unvaccinated or whose status is not known. 16

Iowa families have a separate deadline. SF 304 takes effect July 1 and removes minors' ability to consent on their own to sexually transmitted disease-related vaccines, including HPV vaccination, requiring parent or guardian permission. 17 CIDRAP summarized the practical effect this way: "A teenager in Iowa who wants to receive the HPV vaccine now needs parental consent to receive it." 18 The same Iowa law reporting notes that HPV vaccination can prevent more than 90% of HPV-related cancers. 17

H5 bird flu did not add a new US human case in FluView Week 24. 4 CDC's H5 monitoring page says person-to-person transmission of H5 bird flu has not been identified in the United States and CDC surveillance systems show no indicators of unusual influenza activity in people, including avian influenza A(H5). 19 For households with backyard poultry or dairy exposure, the practical step is still to mention animal contact if anyone develops flu-like symptoms after exposure.

Five actions for this week

Do not wait for a perfect flu-shot date. Waning exists, but the Canadian review did not find consistent population-level benefit from delaying flu vaccination; plan for fall vaccination when it is available and logistically easy for your household. 8
If an adult in the household is 50 or older, watch two MFLUSIVA signals. The first signal is FDA's expected early-August decision; the second is whether ACIP, professional societies, insurers, or Medicare coverage rules create a clear payment path. 11
Check MMR records before travel. CDC's measles count reached 2,134 cases across 41 jurisdictions, and 92% of cases were unvaccinated or unknown vaccination status. 16
Iowa families should plan HPV appointments with the new consent rule in mind. Starting July 1, minors need parent or guardian permission for HPV vaccination in Iowa. 17
Families connected to basic training, dorms, camps, or similar settings should treat flu vaccination as operational planning. Lackland's outbreak shows how quickly flu can spread when many susceptible people live and train together. 1

Cover image: AI-generated editorial illustration.

Don't wait on flu-shot politics