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Mild, temporary vaccine side effects? That’s a sign they’re working, experts say

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side effects being reported in those receiving COVID-19 vaccines, and experts say that’s mostly a good thing.Vaccines are supposed to trigger an immune response, they say.

That’s how you know they’re working.“If you have a vaccine that doesn’t produce a reaction in people, the resulting immune response is weaker,” said Earl Brown, a microbiologist with the University of Ottawa.Brown says vaccines work by stimulating our immune cells to grow and communicate with each other, giving directions on where to set up for an impending attack by the virus.

That results in inflammation, with some of those cells traveling to lymph nodes and causing swelling. What you should know about COVID-19 vaccine side effects The mRNA vaccines from.

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