What Happens If You Don’t Have Any Vaccine Reaction?
But experts say that both side effects and a lack thereof are no cause for concern. “The reason why people have different levels of side effects or different severity is complex and not fully understood,” Abisola Olulade, MD, a San Diego-based physician, tells Refinery29. However, we do know that side effects are connected to immune response, which is why people who are older — and have weaker immune systems — are actually less likely to experience them. “Essentially, when you get a vaccine, your body recognizes it as foreign, and then it triggers inflammation. And that’s essentially what gives those side effects. So some people may not have that trigger as strongly as others.” 

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