E. Coli. In addition, raw beef can carry other bacteria such as Salmonella, Clostridium, Camplyobacter, etc, as well as some parasites and viruses.
I watched an episode of trading spouses, and there's this family who lives not to far from, who only eats raw food. They get checked regularly and so do their kids, and they are just as healthy as anyone else.
Read the book, SLAUGHTERHOUSE, by Gail E(I can't think of her last name but it begins with 'E' and ends with 'Z'). Check the reviews at amazon, after reading this, you may never eat meat again! It is nasty and those animals are treated cruelly before they die to become our food. Someone mentioned that eagles eat it raw? Theirs is fresh-kill, it did NOT go through a slaughterhouse. You owe it to yourself to be informed. You're welcome.