1. Get your flu shot (this year and every year).
The FDA updated all three virus components of the 2026-2027 flu vaccines, including a change aimed at the H3N2 subclade K virus that circulated widely in 2025-2026. Because the strains shift most years, you should get your flu shot every year. (There is no vaccine for “the common cold,” which is caused by a lot of viruses with a lot of variants.)
September and October are generally the best window for most people who need only one dose, with everyone ideally vaccinated by the end of October. That said, a few groups have different timing:
- Kids getting their first-ever flu vaccine: Children who need two doses should get the first one as soon as the vaccine is available, since the second dose has to follow at least four weeks later. Waiting until October can push full protection into November, which you want to avoid.
- Adults that are 65+: People over 65 are eligible for high-dose or adjuvanted vaccines, which are designed to produce a stronger immune response than the standard shot.
- Pregnant women: Talk to your doctor about getting vaccinated in July or August, since it helps extend some protection to the newborn during the months before the baby is old enough to be vaccinated.
- Adults that are 50+: Ask your doctor about mFLUSIVA, the first mRNA flu vaccine approved for adults 50 and older.
Don’t forget to build in some lag time: it takes up to two weeks after vaccination to build full immunity, so getting everyone vaccinated well before flu activity picks up in your area matters more than the exact calendar date.