Same strains, different formulations: high-dose or adjuvanted for 65-plus, standard for healthy adults, egg-free versions for allergies. September-October timing; any shot beats none.
What to do
Common questions
What is the difference between flu shots?
All flu shots target the same seasonal strains, and the alphabet of options is about formulation, not different protection levels. The CDC lists the main types: standard-dose shots for most adults and children over six months; high-dose flu vaccine - four times the antigen - designed for 65-plus, whose immune systems need the bigger push, with better protection shown in that age group; adjuvanted flu vaccine - also for 65-plus - which adds an immune-boosting ingredient to similar effect; and egg-free options - cell-based and recombinant - for people with egg allergies or who simply prefer them. The nasal spray exists too, for healthy non-pregnant people 2 to 49. Which one is yours: over 65, the preferential recommendation is high-dose, adjuvanted, or recombinant - the senior formulations - but any flu shot beats none, and no one should skip vaccination because the preferred version is out of stock. Under 65 and healthy: the standard shot. Egg allergy: the egg-free versions, or any shot under observation if the allergy was ever severe - guidelines now say most egg-allergic people can take any flu vaccine. Timing: September and October are the sweet spot - immunity from a flu shot wanes over months, so vaccinating too early can leave you thin by late-season peaks. A flu shot cannot give you the flu - the sore arm and day of achiness are your immune system practicing. Pymander is a free AI doctor, 24/7 by text. Share your age and health conditions, and it can help you pick the right shot.