Same Evidence, Different Advice: Navigating the Maternal Vaccine Rift

For most of modern obstetric practice, the question "what does the CDC recommend?" and the question "what does ACOG recommend?" had the same answer. In 2026, they no longer do.

In this episode, we walk through how the two most influential sources of maternal immunization guidance in the United States came apart, what each one now actually says, and — most importantly — what that means for the pregnant patient sitting in your office, or for the pregnant person reading conflicting headlines and trying to decide what to do.

What we cover

• How we got here. The May 2025 announcement removing COVID-19 vaccination from federal recommendations for healthy children and pregnant women; the replacement of the entire Advisory Committee on Immunization Practices in June 2025; the shift to "shared" or "individual-based" clinical decision-making; and the January 2026 overhaul of the childhood schedule made without the standard ACIP process.
• ACOG's break from ACIP. In February 2026, ACOG withdrew as a liaison organization to ACIP, citing concerns that the committee's scientific integrity and evidence-based approach had been compromised.
• The first independent maternal schedule. On June 10, 2026, ACOG released its 2026 Maternal Immunization Schedule — the first time the College has issued a schedule that differs from federal recommendations. It is endorsed by 13 medical societies and health organizations.
• Where the two schedules actually diverge. ACOG places four vaccines in the "routinely recommended during pregnancy" category: influenza (inactivated or recombinant), COVID-19, Tdap, and RSV. Current federal guidance routinely recommends Tdap and RSV in pregnancy, and treats COVID-19 vaccination as an individual decision-making conversation rather than standard preventive care.
• The thimerosal question. Federal guidance advises thimerosal-free influenza products; ACOG's position is that thimerosal-containing vaccines are safe in pregnancy.
• What hasn't changed: the evidence. Pregnancy remains a recognized risk factor for severe COVID-19 illness, ICU admission, and mechanical ventilation. Millions of doses administered in pregnancy have not shown an increased risk of adverse maternal or fetal outcomes. Maternal vaccination transfers antibodies transplacentally to infants under six months, who are too young to be vaccinated themselves.
• The counseling problem. As of February 2026, roughly 11% of pregnant women had received a COVID-19 vaccine this season — a substantial drop from the prior year. We talk candidly about what happens to uptake when guidance becomes contradictory, and how to have a productive conversation with a patient who has read three different things from three "official" sources.
• Practical guidance for clinicians. Documentation, timing windows, coadministration, and how to counsel without either dismissing a patient's hesitancy or overstating certainty.

Key timing windows in ACOG's 2026 schedule

• Influenza — inactivated or recombinant product only, any trimester, ideally before the start of flu season.
• COVID-19 — any trimester, any available product, with emphasis on vaccination at the earliest opportunity.
• Tdap — every pregnancy regardless of prior Tdap history, preferably early in the 27–36 week window.
• RSV (Abrysvo) — a single dose between 32 weeks 0 days and 36 weeks 6 days; infant monoclonal antibody is an alternative, including in subsequent pregnancies after a prior Abrysvo dose.

The takeaway

Federal recommendations changed. The underlying science did not. Where guidance conflicts, the question for clinicians is not which agency has more authority but which recommendation is supported by the evidence — and how to communicate that clearly enough that patients can make an informed decision rather than a confused one.

Resources

• ACOG 2026 Maternal Immunization Schedule — acog.org
• ACOG Practice Advisory: COVID-19 Vaccination Considerations for Obstetric–Gynecologic Care
• ACOG: COVID-19 Vaccines and Pregnancy — Conversation Guide for Clinicians
• CDC: COVID-19 Vaccination for Women Who Are Pregnant or Breastfeeding