Oh the one from the hospital..... forgot about that one. I'll have to change maps and check it out.
The untested comes from a trader.... the government comes from the broadcast mission with 3 people wanting you to pick up the supply drop.I am not sure where I got them from (besides the ones I made) I bought them from tarders when they set up camp I think or looted during one of the zombait zombomb zombrub quests. I saw I had three types when I got a mission to bring a cure to a survior out in the field. The only difference is the description as far as I can tell.
EDIT: and by tarders I of course mean TRADERS, lol