Like bacteria, the insects are becoming resistant to the chemicals used to kill them
TO ERNEST HEMINGWAY, Paris was a movable feast. To a bedbug, so are Parisians. In videos recently shared on social media, the seats of the city’s metro are seen swarming with bedbugs, tiny insects no bigger than an apple pip, which feed on human blood. The direct health risk from bedbugs is minor, limited to itchy bites and a small risk of allergies and secondary infections.
But no human pathogen is known to use bedbugs as a vector—perhaps because there has not been time for one to evolve the ability. The insects thrive in warm environments close to food sources and with plenty of dark places to hide. Big cities, and crowded blocks of flats, are ideal. Some estimates suggest that three-quarters of British homes had a bedbug problem by around 1900. The bugs shelter in the crannies of furniture, in mattress seams or in cracks in walls, coming out to feed at night.
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