Yellow jackets are most likely to sting in the fall when their natural food source, other insects, is less abundant, so they gravitate to picnics, barbecues and trash cans.
They're also a problem in summer because they are nesting and reproducing.
Yellow jacket is the common name in North America for predatory wasps. They can be identified by their distinctive yellow markings and a rapid, side to side flight pattern prior to landing. All females are capable of stinging.
More dangerous than a bee
Yellow jackets, hornets and other wasps can sting multiple times. About 4 percent of the human population is sensitive to insect stings, but allergic reactions aren't predictable. You may not have a reaction the first few times, then break out in hives the next time.
Insect repellent is designed to chase off biting insects like mosquitoes. They don't work on bees and wasps. When dining outdoors keep serving dishes covered and garbage bags closed.
The most serious reaction
Systemic reactions that spread to other parts of the body are the real worry. Such cases start with hives and swelling all over the body. They can spread to organ systems, causing respiratory problems, low blood pressure, gastrointestinal problems and cardiovascular irregularities. They can lead to unconsciousness and death, according to the American Academy of Allergy Asthma & Immunology.
Those at risk for systemic reactions should carry epinephrine and seek medical care immediately..
