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Poisonous caterpillar has reached Sweden: Experts warn against contact

2026-08-18

Poisonous caterpillar has reached Sweden: Experts warn against contact

A poisonous moth caterpillar, colloquially known as the "hell caterpillar" or oak processionary moth, has now entered Sweden. The caterpillar is known for causing severe allergic reactions in both humans and animals. Experts are now urging the public to be vigilant when spending time in nature.

What makes the caterpillar dangerous is its thousands of tiny, poisonous hairs. These hairs can detach and be carried by the wind. If the hairs come into contact with the skin, they can cause painful rashes, itching, and eye irritation. If you happen to inhale the hairs, it can also lead to respiratory problems.

The caterpillars live primarily in oak trees and build characteristic nests that resemble white silk bags on the trunks or branches of the trees. Since the species is new to the Swedish environment, it is important that authorities now map where they have established themselves. It is still unclear how widespread they are in the country.

If you find a nest or see the caterpillars, you should keep a safe distance and not try to remove them yourself. If you or your pet come into contact with the caterpillars and have a severe reaction, you should contact medical services or a veterinarian for advice. The authorities will continue to monitor the situation closely during the summer months.

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