As a professional beekeeper for 36 years, and full-time operator of my own honey producing company here in the Southwest, I have to say this:
If you're in Texas, Louisiana, New Mexico, Arizona or California and you come across a bunch of bees.....get far away from them quick and don't mess with them at all unless you REALLY know how to deal with a swarm of African Hybrid Bees;
In the warmer months, it's possible for an AHB swarm out of one of the states mentioned above to hitchhike on a semi-truck, a railroad car or any other conveyance where they might settle and ride un-noticed to anywhere in North America, including most all of Canada.... so be just as wary of bees wherever you are during May-October.....
If you know you are prone to severe reactions to bee stings or bites from hornets, wasps.... or whatever.... go have a sincere talk with your friendly local medical practitioner and get a couple of small vials (10cc) of epinephrine and sealed hypodermics and carry them handy in your truck when out away from quick medical care. Take a few minutes to make sure all your co-workers know where they are and proper use of them. If you or anyone else gets stung or bitten and start having difficulty breathing, inject 5cc of the epinephrine just under the skin on your arm, wait a few minutes (the old doc who gave me this advice and some vials and needles said 5 minutes) and, if the symptoms of the anaphylactic shock haven't abated, inject the other 5cc. Be on your way to medical attention while waiting to observe the reaction to the first injection.
Yes, the laws and big-brother regulators may want to limit medical practice to only the qualified medicine priests.... but if it's a situation of life-threatening anaphylactic shock, I'll inject the stung individual first and worry about legalities later....
I quit having reactions to bee stings about 30 years ago. Mosquito bites affect me much more as far as leaving a bump on my skin. During a typical year of bee work, I'll take around 1000-1500 stings over a six-seven month working season, at the rate of maybe 15-20 a day, and, in each case, just scrape out the stinger and go on with my work. Still, the time I took about 55 bee stings in less than one minute left me a little bit dizzy for awhile and might have induced a coma or perhaps even killed someone less immune to bee venom than I. And I've read about attacks by the AHB's (bally-hoo'ed by the sensationalist media as "Killer Bees".... and, yes, their stings have killed many people) in which the bees have stung someone several hundred times in just a few minutes.
One thing to always remember about honeybee stings is that the bee leaves its stinger and almost always the two venom sacs attached to it in the sting site. DO NOT pinch out the stinger!! That actually injects more venom into the sting. Instead, scrape away the stinger with a fingernail or the blade of a pocketknife (the same way you remove a tick -- don't squeeze its body by pinching it off.... scrape it away from right at the skin level....).
Don't mess with bee swarms. Period. Treat a swarm of bees with the same wary respect you have for a coiled up rattler. And remember that bees are much more mobile than rattlesnakes and can chase you for a couple of hundred yards in numbers sufficient to lay a serious number of stings into your skin. You don't need the pain nor maybe even the medical bills. If you have to work where a swarm is, make sure someone who is experienced in dealing with them does it. In the worst case, it will be little consolation to your survivors to hear: "Oh, he wasn't afraid of them at all. He just swatted at a few of them and went on cuttin'...."
Finally, I have to say that honeybees are among our most beneficial insects and, when treated properly by humans, give us the best form of sugar we can eat, pollen and propolis which have great medicinal benefits to us, pollinate most of our food crops, and can be a real enjoyment to watch and study. But they can blow up in your face the same way a chainsaw can kick back all of a sudden.
Take care and work safely.