A person walking within 50 feet of a colony can trigger an attack. Operating power tools or power lawn equipment can trigger an attack from as far away as 100 feet. The AHB will respond in higher numbers than the EHB and more bees will sting the victim. This could cause a problem for someone arriving after an attack and walking into the areas where the agitated bees are. The fact that more of them will sting a victim makes them more dangerous.
Some people are allergic to bee stings.
If you start swelling or have trouble breathing, see a doctor. If you are stung many times, see a doctor whether or not you have symptoms. We declared Los Angeles completely colonized in April 1999. This means that we would not be surprised to find AHB anywhere in the county. Once an area is colonized, it usually takes 2-3 years until they are widespread enough to be found throughout the area.