Africanized bees actually are not more venomous than European honeybees, and, contrary to certain rumors, they can’t kill you with one sting unless you’re highly allergic and fail to get prompt medical treatment. They also can’t sting more than once. Hundreds of stings can kill a human or animal simply due to the total amount of venom injected, but people have been known to survive thousands of stings.
Another persistent myth is that Africanized bees look different from European honeybees. In truth, there’s very little difference in visual appearance, and only a scientist in a lab can determine if a bee is an Africanized hybrid.
If you see a swarm, contrary to popular belief, it’s not necessarily looking to attack. This is a misunderstanding based on cheesy, low-budget movie depictions of these creatures. While Africanized bees will swarm several times a year, they’re usually simply looking for a place to build a new hive. Although they can actually be slightly less aggressive at this stage because there’s no hive to defend yet, you should definitely err on the side of caution and not disturb a swarm that’s on the move.