How many bee stings does it take to kill a human adult?

Depends. Could be just one or 100... Depends on the body's allergic response to the sting. One bee sting could result in anaphylaxis and death. Anyone with such an allergy needs to carry an epi-pen. Ask your doctor about this. It is very important!
Bee stings. On the average it takes 1000 bee stings to kill an adult but only 500 to kill a child. However, if you are allergic it only takes one.