Lead
Michigan recorded a “very high” level of flu-like illness for the week ending Dec. 27, 2025, placing the state in the CDC’s worst activity tier as cases accelerated across the Midwest and nation. Health systems such as Henry Ford and Corewell reported sharp rises in outpatient visits and test positivity, while national data show hospitalizations climbing, led by adults 65+ and children under 5. Influenza A — predominantly the H3N2 subtype — accounts for the large majority of severe cases. The surge has prompted targeted visitor limits at some hospitals and renewed public advisories on vaccination and basic prevention.
Key Takeaways
- For the week ending Dec. 27, about 11.3% of Michigan outpatient visits were for influenza-like illness, above the U.S. average of 8.2%.
- Henry Ford Health reported test positivity above 25% for three straight weeks, peaking at 33% the week ending Dec. 27; last season’s peak was 31.7%.
- CDC data show Influenza A accounts for roughly 97% of hospitalizations nationally, with H3N2 the dominant subtype in sampled specimens.
- Federal estimates for the current season (so far) include about 11 million illnesses, 120,000 hospitalizations and 5,000 deaths, including nine pediatric deaths nationally.
- As of Dec. 27, roughly 24% of Michigan residents had received this season’s flu vaccine and 8.3% had the latest COVID-19 booster.
- Detroit Medical Center implemented visitor limits on Dec. 8, restricting visitors to two at a time and barring those under 13; most other large systems were monitoring but had not limited visitors.
- Hospitals report capacity has remained stable so far despite heavier emergency-department volumes.
Background
Last year’s U.S. influenza season ranked among the worst in 15 years, with elevated hospitalization rates and the highest documented pediatric flu fatalities since at least 2004. That severe season, combined with early signals from Southern Hemisphere and other countries, raised expectations for an early and potentially intense 2025–26 season. The CDC tracks state-level activity using a 13-step map; for the week ending Dec. 27, 18 states registered at the top activity level while 11 more fell into the second or third tiers, including Ohio, Indiana, Missouri and Minnesota.
Regional health systems and public-health authorities watch multiple indicators in parallel: outpatient visits for influenza-like illness, laboratory test positivity, hospital admissions and the proportion of specimens by influenza subtype. Those metrics help guide operational decisions such as visitor policies, vaccine outreach and surge planning. Major Michigan systems named in recent reporting include Henry Ford Health, Corewell Health and Detroit Medical Center; state public-health officials coordinate surveillance with CDC reporting.
Main Event
Data for the week ending Dec. 27 marked a clear uptick in Michigan. Outpatient visits for influenza-like illness rose to 11.3%, up from 7.5% and 4.4% in the two preceding weeks. Henry Ford’s internal PCR positivity climbed to a three-week run above 25%, with the December 27 week at 33% — exceeding the system’s peak from the prior season.
Clinicians described heavy ED volumes during the Christmas period. Dr. Jason Vieder, vice chair of emergency medicine at Henry Ford Health, reported record-setting daily patient counts across the system and a broad mix of ages among the sick, notably many children. Systems said illness is not limited to a single demographic, though national hospitalization increases are concentrated in those 65 and older and children under 5.
Hospitals are balancing increased respiratory caseloads with overall capacity management. Most large Michigan health systems had not imposed formal visitor restrictions as of the most recent reporting, but officials emphasized contingency plans if admissions continue rising. Detroit Medical Center updated visitation rules on Dec. 8, limiting visitors to two per patient and excluding visitors younger than 13 to reduce transmission risk.
Analysis & Implications
The dominance of H3N2 is significant because H3N2 seasons have historically produced higher hospitalization rates, especially among older adults and young children. Vaccine effectiveness can vary by season and subtype; lower early uptake in Michigan (about 24% vaccinated) creates a larger susceptible population entering the peak months. If current trends persist, hospitals could see progressive strain on inpatient staffing and bed availability, particularly in pediatrics and geriatric care units.
Testing positivity above 25% in a major health system indicates substantial community transmission and likely undercounts of true infection incidence, since many mild cases are not tested. Public-health responses typically combine targeted vaccination campaigns, messaging on personal prevention (hand hygiene, masking while symptomatic where recommended), and operational measures like visitor limits and elective-care triage to preserve capacity.
Economically, a pronounced flu wave can disrupt workforce availability across healthcare and other sectors, especially if illnesses cluster in key employee groups. For schools and childcare, rising pediatric cases can increase absenteeism and pressure on working parents. Policymakers may consider bolstering vaccine access, accelerating booster campaigns where appropriate, and allocating surge resources if hospitalizations climb further.
Comparison & Data
| Metric | Week ending Dec. 13 | Week ending Dec. 20 | Week ending Dec. 27 |
|---|---|---|---|
| Michigan ILI outpatient visits | 4.4% | 7.5% | 11.3% |
| Henry Ford test positivity | ~16.5% (2023-24 peak) | >25% (2nd week) | 33% (peak) |
| National flu hospitalizations (cumulative) | N/A | ~120,000 (federal estimate) | |
The table contrasts recent week-to-week increases in Michigan outpatient visits and Henry Ford positivity with prior seasonal peaks and federal cumulative hospitalization estimates. The rapid rise over two weeks suggests early acceleration; however, week-to-week surveillance can be influenced by testing patterns and care-seeking behavior.
Reactions & Quotes
Health-system leaders emphasized vigilance while noting current operational stability.
“We’ve been seeing quite a bit of viral illness and had record-setting patient days around Christmas,”
Dr. Jason Vieder, Henry Ford Health (emergency medicine)
Public messaging from clinicians stressed basic prevention steps as the first line of defense.
“We really need to be vigilant about handwashing and staying home when sick,”
Dr. Jason Vieder, Henry Ford Health
Hospital administrators explained policy changes taken to limit transmission in inpatient settings.
“We updated visitation guidelines to reduce exposures and protect vulnerable patients,”
Detroit Medical Center spokesperson (hospital official)
Unconfirmed
- Whether the current seasonal vaccine’s effectiveness against circulating H3N2 strains will substantially curb hospitalizations later in the season remains to be measured and formally reported.
- Future statewide visitor restrictions or systemwide capacity limits are possible but not yet announced except at Detroit Medical Center.
- Projections about the season peaking early or reaching higher cumulative hospitalizations than last year are model-based and subject to revision as new surveillance data arrive.
Bottom Line
Michigan is experiencing an early, intense wave of influenza activity dominated by H3N2, with outpatient visits and test positivity rising markedly through the week ending Dec. 27. Hospitals report heavier ED volumes but, so far, stable overall capacity; localized visitor limits have been used as a preventive step where systems judged it prudent.
The combination of low vaccine uptake so far and a subtype associated with severe outcomes increases the risk of continued pressure on health-care services. Individuals should consider vaccination if unvaccinated, practice routine respiratory precautions, and keep symptomatic people home to limit spread. Public-health officials will be watching laboratory and hospitalization trends closely to guide any further system-level measures.
Sources
- MLive.com (local news) — initial reporting and state health-system interviews.
- U.S. Centers for Disease Control and Prevention (CDC) (federal agency) — weekly flu activity indicators, subtype and hospitalization estimates.
- Henry Ford Health (health system) — internal testing and clinical observations cited by system clinicians.
- Detroit Medical Center (health system) — visitation policy update and operational guidance.