If a guy as a vasectomy can you get pregnant still?

When a man has a vasectomy, the vas deferens (the tube that transports sperm from the epididymus in anticipation of ejaculation) is severed and tied shut, which prevents the flow of sperm. This procedure is generally considered to have a very high level of success in preventing unwanted pregnancy. I think the statistics are something like 2 in every 3000 or so vasectomies result in a pregnancy. It's pretty foolproof as Birth Control measures go. Just know that vasectomies DO NOT protect against STD's or HIV.