![]() If the invader is encountered again, months or even years in the future, it’s these immune cells that will recognize the old enemy and start generating the antibodies that will take it down. ![]() It relies on your immune system’s T and B cells that learn to recognize particular invaders, such as a protein from the coronavirus. This is the long-lasting adaptive immune response. The second line of defense takes days to weeks to get up and running. ![]() This first line of defense is relatively short-lived, lasting hours or days. White blood cells called neutrophils and macrophages travel to the intruder and work to destroy it. This system is activated as soon as your cells notice you’ve been exposed to any foreign material, from a splinter to a virus. The initial response is due to what’s called the innate immune response. Your immune system responds to the foreign molecules that make up any vaccine via two different systems. What does your body do when you get a vaccine? ![]() Is there any link between what you can notice after a vaccine and what’s happening on the cellular level inside your body? Here’s what you need to know. If someone gets a headache or feels a bit under the weather after receiving a COVID-19 vaccine, it’s become common to hear them say something like “Oh, it just means my immune system is really working hard.” On the flip side, when people don’t notice any side effects, they sometimes worry the shot isn’t doing its job or their immune system isn’t reacting at all. ![]()
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