One that doesn't have deleterious side effects that kill some and maim some and very badly damage some? Seriously?
Some vaccines take upwards of TEN YEARS to develop. I don't know what the fastest SAFE EFFECTIVE VACCINE is or how long it took to get to market or what the side effects were. Do you? Ever do any research or investigate or did you just take the headcheese view that "in a certain period of time" we will have a vaccine by the end of the year. We will. WHICH YEAR? 2020? Hahahahahahaha. A miracle if we do.
Still you believe what headcheese tells you don't you? Of course you do. That is why he adores you and could not live without you. SIGH.