What is the difference between flu shots?

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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.

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What is the difference between flu shots?

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