No control group is a bit... odd.<p>Some of these results <i>could</i> be because the 1st dose of the vaccine doesn't provide 100% protection, so the increased incidence of illnesses could be a side-effect of COVID infections, not the vaccine itself. Different vaccines provide different amounts of protection against different strains, and we know that the strains have varying effects <i>including</i> some of the observed illnesses.