I am pretty sure I read that all the ferrets and rats were "sacrificed" shortly after the vaccination to check for the antibodies in their organs. From what I read, no long term studies were done to see if there were any side effects. I don't have the sauce, but I'll look for it and update. Ive been researching every night trying to get to the original study material, but it is a maze. Ive been to over 200-300 websites in the last week, so hard to keep track