the problem with hamburger is its GROUND meat, the problem with beef is e. coli posioning, in ground meat the (possible) e. coli will be everywhere in the meat (does that make sence? i can find links that explain it better if you want)
however thats oviously not the case here since your fine hun, done worry i got selmonella poisoning when i was preg (the whole peanut butter thing from last year, yeah i got really sick) and both my daughter and i are fine