Invasive Asian needle ants expand rapidly across the US, triggering health alerts
An invasive ant species originating from China is rapidly spreading across the United States, prompting health officials to advise caution, according to a report by The New York Post.
Known as the Asian needle ant, the small dark brown to black insect—measuring less than a fifth of an inch—has now been found in at least 20 states. These include Florida, Georgia, Texas, New York, Pennsylvania, as well as northern regions such as Massachusetts and Wisconsin. Although the species was first identified in the US more than 90 years ago, experts say its population has grown significantly in recent years.
Unlike many common ants, the Asian needle ant does not build visible anthills. Instead, it nests in concealed locations such as leaf litter, decaying wood, and wooded areas, increasing the likelihood of accidental encounters.
The ant’s sting is known to cause sharp and intense pain that can recur over several hours. In some cases, individuals have reported the pain spreading beyond the initial sting site. For those with allergies, the sting can trigger anaphylaxis—a severe and potentially life-threatening reaction. Its stinger is also capable of penetrating clothing.
“Imagine somebody inserting a needle directly into your flesh,” said Benoit Guenard, an entomology professor at the University of Hong Kong, who has studied the species in North Carolina. “It’s a very sharp, acute pain, but quite localized.”
According to the US Department of Agriculture, the pain from the sting may come and go over a period of several hours.
Experts note that the Asian needle ant is not naturally aggressive and typically stings only when disturbed. Unlike fire ants, it is not considered a widespread public health threat. However, people working outdoors are advised to wear protective gloves and exercise caution if they encounter the insects.
The USDA has indicated that, like many invasive species, the Asian needle ant is likely to remain a permanent presence in the United States.
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