Thank you for your review! We're grateful hear that you're happy with the fluidity of the game!
After the end of each round, every citizen in the city (including you) will be vaccinated. This way you don't have to murder so many citizens. I would suggest saving your antidotes for yourself or the last remaining citizens. We're sorry for this confusion. It will be fixed in our next update! :)
Let us know if you have any other suggestions! We appreciate your support!