In anticipation of a fall and winter surge in COVID cases, new bivalent booster shots are available to anyone older than 5 (or 6 and up if you opt for Moderna instead of Pfizer).

The latest jab protects against the highly transmissible omicron variant while also bumping up protection against the original strain of COVID-19.

If you are at least two months out from your last COVID vaccine or a COVID infection, you can get the booster now. If you were just recently vaccinated or infected, your timeline is a little different .

Either way, its important to get this new COVID shot, which can prevent you from severe outcomes, including hospitalization or death, throughout the fall and winter seasons. Just how long will this new shot protect you overall, though? Experts weigh in.

Its not yet known how long immunity lasts after the new shot, but experts have some theories.

For now, theres no exact timeline for how long immunity persists after getting the booster, according to Dr. Andy Pekosz , co-director of the Center of Excellence for Influenza Research and Response at the Johns Hopkins Bloomberg School of Public Health. This is because the vaccine is new it was authorized at the end of August by the Food and Drug Administration .

Its important to note that there are lots of studies that are measuring the immunity timeline, he said and many of those studies are happening now.

One study published in the New England Journal of Medicine found that this new shots protection lasted at least a month (but it likely lasts longer than that, since the study has measured only a month so far). Additionally, previous studies of other bivalent COVID vaccines showed that immunity lasted about six months .

In time, experts will know how long immunity lasts, but for now, that information is still coming.

Experts have no reason to believe immunity wanes any faster than with previous boosters, so it could last four to six months.

Just how long youre protected after a COVID booster shot varies from person to person, and it has also rapidly changed as new COVID mutations emerge that can evade antibodies. But generally after previous COVID shots, you were protected for about four to six months .

Both Pekosz and Dr. Benjamin Abramoff , On/Go medical adviser and founder and director of Penn Medicines Post-COVID Assessment and Recovery Clinic, said there is no reason to believe your immunity will wane any sooner after this new booster.

Everything we know about boosters for COVID, as well as for other vaccines, is that youll strengthen the long-term immunity the memory immunity with a booster, Pekosz said.

In other words, youre adding on to the immunity you already have from the original vaccine series, the booster, and, for many people, from prior COVID infections, too.

The next time your body sees the virus, youll develop a faster and stronger immune response, Pekosz said. Thats a principle that has shown to be true with other [boosters], and we assume therefore it will be true for this as well.

This memory immunity also contributes to how quickly youre protected after vaccination, too. Pekosz said that 10 to 14 days after you get this booster, your antibodies should fully kick in.