Interesting how people forget about treatments that have worked in the past. As a kid, I remember watching at least 1 old movie where the plot developed around the idea that they had to find the 1 person whose blood plasma held the cure to a disease that the person had overcome. I wish I could remember the name. But this is an old idea. The big problem is that it's hard to scale and it's not 100% curative. But it's definitely better than nothing.