The hepatitis A vaccine is required for school entry in about 20 states and the District of Columbia, but it is not a nationwide mandate. Whether your child needs it depends entirely on where you live and, in some cases, what grade they’re entering. Every other state still recommends the vaccine for all children starting at 12 months but leaves it off the list of shots needed to enroll.
States That Require the Vaccine
As of 2024, the following states mandate hepatitis A vaccination for school entry: Alaska, Arkansas, Colorado, Georgia, Hawaii, Idaho, Indiana, Kansas, Kentucky, Louisiana, Nevada, New Mexico, Oklahoma, Oregon, South Carolina, Tennessee, Texas, Utah, Virginia, and the District of Columbia. Arizona requires it only in Maricopa County.
Not all of these states apply the requirement to every grade. Some, like Texas, Georgia, and Oregon, require proof of vaccination from kindergarten through 12th grade. Others only require it at specific entry points:
- Kindergarten only: Colorado, Louisiana, Tennessee, Utah, Virginia
- Kindergarten through 1st grade: Arkansas
- Kindergarten through 2nd grade: New Mexico
- Kindergarten through 4th grade: South Carolina
If you’re in a state that mandates it only for kindergarten, your child typically needs to have received the vaccine before starting school, but older students transferring in may not be held to the same requirement. Check with your school district or state health department for the exact rules, since enforcement details vary.
What the CDC Recommends for All Children
Regardless of your state’s school requirements, the CDC’s Advisory Committee on Immunization Practices recommends routine hepatitis A vaccination for all children between 12 and 23 months old, with catch-up vaccination for anyone aged 2 through 18 who missed it. The series consists of two shots given six months apart. Over 97% of children develop immunity within a month of the first dose, and that number reaches 96 to 100% after the second.
If your child is older and never received the vaccine, the catch-up schedule is straightforward: one dose now, a second dose at least six months later. There’s no need to restart the series if you fall behind on timing.
Why Some States Made It Mandatory
Children were historically the age group most likely to get hepatitis A, with infection rates of 15 to 20 cases per 100,000 in the early to mid-1990s. The tricky part is that infected children often show no symptoms at all, which means they can unknowingly spread the virus to family members and other close contacts who may get seriously ill. Schools themselves aren’t common sites for outbreaks, but unvaccinated kids can carry the virus home.
Since routine childhood vaccination began in 1996, reported cases of acute hepatitis A dropped by over 95% within 15 years. That dramatic decline is largely credited to vaccine uptake, and states with school-entry requirements have been a major driver of high coverage rates.
Exemptions If Your State Requires It
Every state with a vaccine mandate allows medical exemptions, which typically require a written statement from a licensed physician explaining why the vaccine is unsafe for a specific child. Many states also allow religious exemptions, and some permit philosophical or personal belief exemptions. The process varies: some states ask for a simple signed statement, while others require notarized documents or completion of a vaccine education module before the exemption is granted.
One important detail parents sometimes overlook is that exempted students can be temporarily excluded from school during an outbreak of a vaccine-preventable disease. Many states require parents to sign an acknowledgment of this possibility as part of the exemption paperwork. Exemptions may also need to be renewed annually rather than filed once.
Side Effects in Children
The hepatitis A vaccine has a strong safety record. Common side effects are mild and typically last one to two days: soreness or redness at the injection site, low fever, fussiness in toddlers, and temporary loss of appetite. In children under 2, drowsiness and irritability are also reported frequently. Severe allergic reactions are rare. Between 1995 and 2005, roughly 50 million doses were distributed in the U.S., and a large study of over 49,000 doses given in California found no health problems linked to the vaccine.
College and Beyond
No U.S. state currently requires the hepatitis A vaccine for college enrollment. Some colleges recommend it, and a few states require universities to provide students with information about hepatitis A, B, and C, but proof of vaccination is not a condition of admission. If your child missed the series entirely during childhood, it can still be completed at any point with two doses spaced six months apart.