Venomous Invasive Ant Spreading in the U.S., Experts Warn of Health Risk

A venomous ant species capable of causing severe allergic reactions is expanding its reach across the United States, prompting scientists to raise alarms.

Known as the Asian needle ant, this stinging insect has been in the U.S. since 1932, according to the U.S. Department of Agriculture. Originally from Asia, it has become well-established in Southeastern states, including Georgia and along the Eastern Seaboard.

Dan Suiter, a professor of Urban Entomology at the University of Georgia and an Orkin distinguished expert, now classifies the insect as a “medically significant pest” due to its potential to trigger life-threatening allergic reactions in humans.

While most ants are more of an annoyance, the Asian needle ant is dangerous for individuals with allergies. “It’s not just a nuisance when it can cause anaphylaxis,” said Suiter.

As both a researcher and extension entomologist, Suiter often assists homeowners and pest professionals in identifying insects. In 2024, he received three separate reports of people suffering severe allergic reactions after being stung by this ant.

Though not typically aggressive, the ant will sting if it becomes trapped under clothing. Its sting can lead to anaphylaxis — a serious, potentially deadly allergic response. According to the USDA, symptoms include throat or tongue swelling, difficulty breathing, rapid heartbeat, skin hives, low blood pressure, and even fainting or psychological distress.

There’s currently no way to predict who might suffer a severe reaction. Suiter advises individuals who are allergic to bee or wasp stings and carry epinephrine (EpiPens) to be especially cautious.

Habitat and Behavior

Asian needle ants prefer moist, wooded environments and are often found in rotting logs, firewood, under rocks, or in leaf litter. They’re small — about 3/16 of an inch — and most active in the summer, especially July and August.

Unlike other ants that form visible trails, these ants move erratically and typically alone. “They kind of wander — like they’re lost,” Suiter noted.

Why Identification Matters

Because there are dozens of ant species in regions like Georgia, proper identification is essential. Suiter suggests taking a photo of the ant and sending it to a local university extension office for expert analysis.

Beyond posing health risks to humans, Asian needle ants also displace native ant species that play crucial roles in local ecosystems, such as dispersing seeds. This ecological disruption can impact plants and other wildlife. “They may be small, but they’re highly invasive and ecologically damaging,” Suiter explained, comparing them to invasive reptiles in Florida.

Controlling the Spread

To reduce the ant population, Suiter recommends keeping firewood dry and off the ground, and removing decaying logs. He also says baiting methods — typically available through professional pest control companies — can help manage infestations more effectively than DIY options.