Why do vaccines cause allergic reactions?

I heard that coronavirus anf flu vaccines cause allergic reactions. Does anyone know why?

wldswede2021-02-06T01:50:59Z

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People can technically be allergic to anything and vaccines have multiple ingredients, so if a person is allergic to one of those ingredients, they will be allergic to the vaccine... just like any other vaccine, food, etc. 

Anonymous2021-02-10T14:58:21Z

Because it's a Government conspiracy to make you allergic to everything and no immunities.

Farid2021-02-06T19:08:29Z

At the point when I used to offer influenza chances, I needed to inquire as to whether they were hypersensitive to eggs. The seasonal infection was brooded in egg whites prior to being bundled in vials for circulation. I needed to have epinephrine convenient in the event that they had a hypersensitive response to influenza shot.

Diane A2021-02-06T01:26:37Z

Nothing is incubated in aggs anymore, although they were. But people can be allergic to any number of known or unknown substances that trigger various allergic pathways and cellular products like histamine. The allergic pathways, there are several, are complex.

Tarkarri2021-02-06T01:20:31Z

Because some vaccines contain traces of things some people are allergic to.
E.g. some vaccines are grown in a medium that contains egg. These vaccines can trigger people with egg allergies.

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