Lot of neat stuff lost to time. In the 30s some doctors discovered that every disease, bug, virus, etc had a frequency it will respond to and self destruct. Kind of like an ultra sonic pool and kidney stones. You can target the thing that causes a disease and immediate eliminate it from the subjects body. Its however cloaked in a lot of controversy as those involved were all killed or died in mysterious ways and some oil company bought it out and it never saw the light of day.
