> biologist here, answer is surprisingly yes and here's how. thought experiment and suspending disbelief... imagine a man in the year 400's had temporal access to the bubonic plague vaccine we have today. imagine one man defeats the bubonic plague which kills half its targets caught it fully, and defeated it with his own immune system without assistance, that immune system was for any set of reasons that please you: more able to do the job of the immune systeming. now suppose the other man with exactly the same dna, got the vaccine also survived, but with our temporal access we can know he wouldn't have without the vaccine. the men who kicked the bubonic plague without assistance naturally has the superior dna but remember we're holding that as fixed, both men have the same dna. the unenhanced dna is superior because your immune system drifts with the female egg babyfactory because the egg's grown environment and immune system design is half defined by the male's immune system which comes through an army of r, b, t lymphocytes which are almost like your body's clandestine attack services. your immune system gets up into the baby factory by all the usual ways, kissing, touching, sharing bodily fluids, your immune system can grow in power if you share fluids with another who has an immunity, this is proven. so yes, you people who kicked covid19 by yourselves, have a "more muscular immune system" that rose up to handle the job itself, rather than falling over and dying, nay, the purpose the simulation created you, for surviving and resource gathering from protection to babyfactory.
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