I'm a native Arizonan, and having lived here all my life, I can tell you of only one encounter with Africanized bees myself. Fortunately, I was on an ATV at the time and was able to outrun the swarm.
Like everything else in the desert, bees of all kinds need water. Regular honey bees won't attack you for being near an exclusive water source, like a leaky sprinkler head or hose spigot. But Africanized bees will,...as I found out. I was out riding near my rural property and came upon a leaky water pipe along a dirt road. I was curious about it, because it had been unattended for quite some time and the puddle it had generated was sizeable. In the desert, this sort of thing generates curiosity, as no one wants such a precious asset wasted. I rolled up to it and was about to dismount to get a closer look. But I began to hear what sounded like a buzzsaw. I thought something was going wrong with my ATV. But in a moment, I realized the sound was behind me, not under me. As I looked behind me, all I saw was a cloud of black dots rapidly moving towards and down upon me. Fortunately, I instantly realized what it was, and I gunned the motor and sped away. After going about 50 yards, I stopped and looked back. They were still after me and were getting closer again. I gunned it again and drove perhaps a 1/4 mile before I stopped again to look back. They had finally given up. I got lucky.
But as much time as I have spent in the outdoors here, that is my only encounter with them. I've had several instances of regular bees transiting through the ranchette and try to set up residence. Once, they succeeded in finding an open crack to build a hive in the eave over the front door. But I haven't been stung by a bee since I was kid in the 70s. The incident on the ATV few years ago is the closest I've come. But it is scary, because if I had been on foot,....