so if you have covid circulating, getting the vaccine would cause an artificial headstart? but all side effects still occur?When you inject something it harms the immune system, hindering it's ability to mount a response normally. If you already have the response circulating at time of injection, you get artificial headstart compared to if the exposure was natural. If it was natural, you still get headstart of course if the challenge is compliant with the vaccine generated response, but this does not matter as much as a normally functioning immune system can mount a normal response and have no trouble.