people who are either elderly or compromised would normally have a flu vaccine which helps them somewhat.
Unfortunately, your immune system declines with time, so the flu can kill elderly people even if they have had a flu vaccine.
Widespread vaccination helps build up herd immunity, meaning that if almost everyone is protected by vaccinations, it can protect the weakest and most vulnerable from getting exposed in the first place.
Even if a flu vaccine doesn't stop an infection, it can lead to a milder, more survivable case, which helps.
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