Great point. Covid19 is now a global disease. The challenge of vaccinating even enough of the population to give some degree of herd immunity is daunting. The uncertainty of the vaccines effectiveness is an additional complication. At this point we have no idea how effective it is,what kind of side effects. how often it would have to be given, if it works on all genetic variations or mutations of the virus, are there individuals who should not take it ,how do you prioritize inoculations, which vaccine is best for which person and many other points.

Good luck to all