> give a measured light dose, and reliably generate a mild case. That’s how it used to be done, eg for smallpox. Inoculation or variolation: https://en.m.wiki

> give a measured light dose, and reliably generate a mild case. That’s how it used to be done, eg for smallpox. Inoculation or variolation: https://en.m.wikipedia.org/wiki/Variolation https://en.m.wikipedia.org/wiki/Variolation