Researchers may have found the key to creating the ultimate snake antivenom, and all it took was someone getting bitten 200 times.

Scientists have created what they believe to be the most broadly effective antivenom to date — and its key ingredient came from a single man's blood. Both the researchers and the donor reveal how it all came together.

Jacob Glanville, founder of San Francisco-based vaccine developer Centivax and lead author of the study, met Friede in 2017. Working with Peter Kwong , a Columbia University vaccine researcher, Glanville’s team isolated the antibodies and tested them in the mice.