LONDON — Droves of white-haired caterpillars have invaded the British capital, with experts warning they can trigger allergic reactions in humans and pets.<br /><br />The BBC reports that UK officials have issued a health warning following an outbreak of toxic caterpillars of the oak processionary moth across London and southeast England.<br /><br />The species is a native of Southern Europe, but was accidentally introduced to Britain via imported live oaks in 2005.<br /><br />Each caterpillar contains 62,000 hairs, which are full of spines that can prick skin. They can be released from the body and stay active for up to five years.<br /><br />The hairs contain an irritating substance called thaumetopoein that can cause skin rashes, eye irritation, sore throats, and breathing difficulties.<br /><br />The British Forestry Commission has begun using biopesticides to help eliminate the caterpillars, and have cautioned residents against letting children or pets near affected areas.<br /><br />Traps will also be set for the invasive insects around the 150 hotspots identified by the commission.
