Separate vaccines for measles, mumps, and rubella are not available in the United States. No monovalent (single-component) versions of these vaccines are currently licensed by the FDA. Merck, the sole U.S. manufacturer, discontinued its individual measles, mumps, and rubella vaccines in 2009. If you’ve been searching for a clinic or pharmacy that offers them as separate shots, you won’t find one operating with licensed products.
Why Separate Vaccines Don’t Exist in the U.S.
The combined MMR vaccine has been the standard approach for decades, and once demand for single-component versions dropped low enough, Merck stopped producing them. There is no FDA-approved standalone measles vaccine, no standalone mumps vaccine, and no standalone rubella vaccine currently on the market. This isn’t a temporary shortage. The products simply no longer exist in licensed form.
No country in the world recommends giving vaccines against these three infections separately. The combined vaccine has been extensively studied and is the only regimen with a robust evidence base behind it. Researchers have pointed out that splitting the doses into three separate injections has never been used as a standard regimen anywhere, meaning there’s limited data confirming that approach is either safe or effective. In the UK, where some private clinics have offered imported single vaccines, health authorities have warned that these are unlicensed products that haven’t been independently tested for safety or effectiveness.
What’s Available Instead
In the U.S., children and adults needing protection against measles, mumps, and rubella have two licensed options: the MMR vaccine (covering all three diseases) and the MMRV vaccine (which adds varicella, or chickenpox). Both are combination vaccines given as a single injection.
The standard schedule calls for two doses of MMR. The first is typically given between 12 and 15 months of age, and the second between 4 and 6 years. Adults who lack evidence of immunity usually need one or two doses depending on their risk factors.
Safety of the Combined Vaccine
One reason parents look for separate vaccines is concern that combining three viral components into one shot might overwhelm a child’s immune system or increase side effects. The evidence doesn’t support this. Studies comparing combination vaccines to their individual components given separately have found no increase in the overall rate of adverse events. For some combinations, like the DTaP vaccine, adverse event rates are actually lower when the components are combined rather than given as separate injections.
The most common side effects of MMR are mild: soreness at the injection site, low-grade fever, and occasionally a mild rash about a week later. Febrile seizures (brief seizures triggered by fever) occur in roughly 1 in 3,000 doses, and while frightening, they don’t cause lasting harm.
Risks of Delaying or Splitting Doses
Spacing out vaccinations to avoid the combined shot carries a real tradeoff: your child stays unprotected against one or more of these diseases for longer. Measles is extraordinarily contagious. An unvaccinated person exposed to measles has about a 90% chance of becoming infected. Mumps can cause hearing loss and, in older males, painful swelling of the testicles. Rubella during pregnancy causes devastating birth defects.
Experts have described the push for single injections as a “backward step” that could endanger children’s health. The concern isn’t theoretical. During periods when MMR uptake has dropped, measles outbreaks have followed quickly. Every extra month a child goes unvaccinated is a month of vulnerability, particularly in communities where vaccination rates have fallen below the threshold needed for herd protection.
There’s also a practical problem. Splitting the schedule into three separate vaccines (if they existed) would mean six injections instead of two, spread across more office visits over a longer period. That increases the chances of missed appointments and incomplete vaccination, which population data consistently shows is what happens when schedules get more complicated.
School Requirements and Documentation
If you’re wondering whether schools would accept proof of separate measles, mumps, and rubella vaccinations instead of MMR, the answer is generally yes, on paper. California’s immunization requirements, for example, specify that “two doses of measles, two doses of mumps, and one dose of rubella vaccine meet the requirement, separately or combined,” as long as doses were given on or after the child’s first birthday. Most states have similar language.
The catch is that meeting this requirement with separate vaccines would require obtaining unlicensed products, since no licensed versions exist. A healthcare provider in the U.S. would not be able to order or administer them through normal channels.
What About Overseas Options
Some parents have explored traveling to the UK or other countries where private clinics have historically offered imported single vaccines. This option comes with significant caveats. In the UK, the only single vaccines available are unlicensed imports that haven’t been independently evaluated for safety or efficacy by UK regulators. British health authorities, including the NHS, actively advise against using them. No major medical organization in any country endorses this approach.
You would also face questions about whether a U.S. pediatrician or school system would accept documentation from an overseas clinic for an unlicensed product, and whether your child’s medical record would accurately reflect what was administered.
If You Have Concerns About MMR
The desire to find separate vaccines often stems from worry about vaccine safety, particularly the now-thoroughly-debunked claim linking MMR to autism. That claim originated from a 1998 paper that was retracted by The Lancet after its lead author was found to have falsified data and had his medical license revoked. Dozens of large studies involving millions of children have found no connection between MMR and autism.
If your concern is about giving multiple vaccines at one appointment, it helps to know that a baby’s immune system handles thousands of foreign substances every day, from bacteria on skin to particles in food. The antigens in all childhood vaccines combined represent a tiny fraction of what the immune system routinely processes. Delaying vaccines doesn’t reduce the immune system’s workload in any meaningful way. It just extends the window during which a child can catch a potentially serious disease.