The 2026 push to roll back New Hampshire’s childhood vaccination requirements appears to have run out of room in the State House. The New Hampshire Senate voted Thursday to send House Bill 1719, the marquee bill that would have stripped hepatitis B from the list of vaccines required for children to attend school or licensed child care, to interim study, a procedural move that effectively kills the proposal for this legislative session. The vote, reported by the New Hampshire Bulletin, is the latest in a string of setbacks for the State House’s Republican anti-vaccine contingent.
Sponsored by Rochester Republican Rep. Kelley Potenza, HB 1719 was the narrowest survivor of an unusually crowded slate of vaccine-related bills introduced this session. Earlier and more sweeping efforts, including a measure that would have ended all state vaccine mandates outright, died on the House floor weeks ago. With Thursday’s voice vote, even Potenza’s targeted hepatitis B carve-out is parked on the shelf until at least next year, when the legislature would have to file new legislation to revive it.
What HB 1719 Would Have Done
New Hampshire law currently requires that children entering public schools, licensed daycare programs, and other regulated child settings receive a defined list of vaccinations, with limited exemptions for medical and religious reasons. Hepatitis B has been on that list for years, in line with longstanding U.S. Centers for Disease Control and Prevention recommendations that infants receive their first hepatitis B dose at birth, with follow-up doses at one and six months.
HB 1719 would have surgically removed hepatitis B from that list. Other required vaccines, including those for measles, mumps, rubella, polio, and chickenpox, would have remained mandatory. Practically, the bill would have given parents who want to skip the hepatitis B series an automatic statutory off-ramp that does not require filing for a medical or religious exemption.
Potenza, who sponsored the bill, has been publicly skeptical of vaccine ingredients for years. According to reporting on this and prior legislative efforts, Potenza has said she believes aluminum adjuvants in the hepatitis B vaccine caused her now-18-year-old daughter to develop a lifelong digestive disorder. The American Academy of Pediatrics, the U.S. Food and Drug Administration, and other major medical and regulatory bodies dispute that connection. Aluminum salts are used as adjuvants in several vaccines to help the immune system respond, but the doses, typically less than 0.5 milligrams, fall well below thresholds for any documented toxic effect in healthy infants.
A Federal Tailwind That Did Not Reach Concord
Part of the political theory behind HB 1719 was that federal guidance was about to shift in the bill’s favor. In December 2025, the CDC’s Advisory Committee on Immunization Practices voted 8 to 3 to revise the federal recommendation for the hepatitis B birth dose, advising that the dose at birth no longer be recommended for infants whose mothers had tested negative for the virus during pregnancy. That change, which followed broader vaccine policy realignment under U.S. Department of Health and Human Services Secretary Robert F. Kennedy Jr., gave Potenza and her co-sponsors what they viewed as a green light to align state law with the new federal posture.
The argument did not land in the New Hampshire Senate. Senators chose to send the bill to interim study rather than pass it, fail it, or amend it. Interim study is a Concord institution that lets a chamber sidestep an up-or-down decision. The bill is referred to a committee for further consideration over the summer and fall, but in practice, interim study is overwhelmingly the place legislation goes to die. Bills sent to interim study can be reintroduced in a future session, but the procedural posture means that for the 2026 session, the hepatitis B requirement stays on the books.
What Else Has Failed This Session
HB 1719 is not the only vaccine-related bill that came up short in 2026. The most ambitious proposal, House Bill 1811, would have ended all vaccine mandates in New Hampshire. Sponsored by Manchester Republican Rep. Matt Drew, that bill failed on a 155 to 192 House vote in February.
Two other bills, House Bill 1022 and House Bill 1584, sought to simplify or expand the state’s existing religious exemption framework, including by eliminating a Department of Health and Human Services form that some lawmakers viewed as cumbersome. New Hampshire’s religious exemption policy is already among the more permissive in the country, requiring only that a parent attest to a religious objection. Critics in the legislature argued the existing form imposed unnecessary friction on parents who already have a legal right to opt out, while public health advocates and pediatricians warned that anything that further reduces friction risks pulling vaccination rates down at a time when nationwide measles activity is rising.
For the State House’s anti-mandate bloc, the cumulative score sheet for 2026 is now: one outright defeat, several bills bottled up in committee, and a marquee narrow bill, HB 1719, sent to interim study just before the session winds down. The political appetite for a sweeping rewrite of New Hampshire’s child immunization statutes, even in a Republican-controlled legislature, evidently has limits.
Why the Hepatitis B Question Has Real Stakes
For most Granite Staters whose kids are already vaccinated and whose pediatricians follow current CDC recommendations, HB 1719’s defeat will not change anything. Babies born in New Hampshire hospitals are still offered the hepatitis B birth dose under standard pediatric practice. School and daycare enrollment forms will still require either proof of the full hepatitis B series or a documented exemption.
The disease itself, though often unfamiliar to younger parents, is not abstract. Hepatitis B is a viral infection that can become chronic and lead to cirrhosis, liver failure, and liver cancer years or decades after infection. Before universal infant vaccination became standard in the United States in the early 1990s, the country saw an estimated 18,000 hepatitis B infections per year in children under 10. That number has fallen dramatically as vaccination coverage has expanded. Public health researchers credit the birth-dose strategy, in particular, with sharply reducing mother-to-child transmission, including among mothers who were unaware they were carriers.
Hospitals and pediatricians’ offices in New Hampshire have also been preparing for the possibility of measles activity, given a string of studies indicating that the state’s measles vaccination rates have dipped enough to elevate outbreak risk. For health officials, anything that further loosens the state’s vaccine mandates, even narrowly, raises concern that overall vaccine uptake could erode. The fight over HB 1719 has played out in the same window as the debate over wraparound mental health coverage for privately insured kids in SB 498, where Gov. Ayotte has been pressuring the House to act.
A Political Read on What Just Happened
The fact that HB 1719 made it through the New Hampshire House and then ran out of momentum in the Senate is itself a useful piece of information about where the legislature is on this issue. The House, the larger and more populist of the two chambers, was willing to roll back a single mandate that aligned with a fresh CDC posture. The Senate, smaller and historically more deliberate, was unwilling to take that same step without more time, more testimony, and more political cover.
Interim study is the polite way for a chamber to say “not now.” It avoids handing the House a defeat, avoids handing public health groups a clean win, and pushes the entire question into next session, when the lineup of senators may look different and the federal landscape on vaccine policy may have moved further. For Potenza and her co-sponsors, that is far from a final loss, but it is also not the win the bill’s supporters were hoping for after the December ACIP vote gave them a federal cue.
For the broader anti-mandate coalition in Concord, the takeaway is that 2026 is now a year for regrouping. Sweeping bills are out. Narrow, ingredient-specific carve-outs are stalled. Religious exemption changes are still moving but face uphill votes. Lawmakers who want to rewrite New Hampshire’s child immunization framework will have to come back in 2027 with a different strategy, a different package, or both. As other recent NH legislative coverage has shown, even when one chamber moves quickly, the second chamber can substantially change the shape of what eventually reaches the governor’s desk.
For now, the state’s vaccine schedule for children, including the hepatitis B series, remains intact. The Department of Health and Human Services continues to administer the existing exemption process. And HB 1719, the bill that briefly looked like the cleanest path to changing that, sits in interim study, where most bills go to wait for a future legislature that may or may not be more interested in picking up the fight.
