It takes a lot of stings to kill an average person, commonly regarded as 7-10 stings per pound of body weight. Folks with an allergy to bee venom might have severe distress or death with only a single sting or two.Didn't realize that Texas bees could really be that aggressive. The ones that would come around my Houston home were docile as could be. I could still cup them in my hands and then let them go after a minute w/out getting stung just like when I was a child in the 50's.
"Africanized" bees generally just respond more forcefully to any disturbances. Whereas with a gentle European honeybee beehive you might be able to do all the work with only a veil or not even that, with an Africanized hive you need full suit. Pre-Africanization if you upset a hive you might get escalating responses from a few bees. In an Africanized hive their "alarm" pheromone is very strong (smells like sweet bananas) and drives hundreds to "defend" the hive from a perceived attack. It's the greater number of bees that respond in a defensive/stinging manner that cause the problems.
If ever attacked, get indoors asap where they cannot get to you. This could be a car/truck or building. European type bees might give up the chase after a few dozen feet, but africanized bees will follow you hundreds or thousands of feet. They are somewhat visual though, if you can dodge through brush and trees to break their line of sight it does help.
http://www.livescience.com/37094-man-dies-in-killer-bee-attack-africanized-honey-bees.html
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