Well, since there WAS NO "Black Death cure", I'm pretty sure it just burned itself out when it ran out of hosts to kill. Covid kills fewer than 1.5 people for every 100 who contract it. Those were its numbers when it began 18 months ago and they STILL apply. The reason we are seeing more deaths isn't due to an increase in mortality but just a reflection of the higher numbers who are being infected. The number of people who have succumbed to the global REACTION to this virus, FAR EXCEEDS the number who have actually died FROM the virus.
The REAL virus is one of the mind, itself. Fear, cowardice, and hate, always kill more than any contagion of the body.