Pesticide-Busting Brit Super Rats Spark Health Concerns

By Mat Probasco,  Newser Staff
Posted May 3, 2009 9:26 AM CDT
Poison bait used to kill these rats in the 1950s won't work on many 21st century rodents, which are increasingly immune to pesticides.   (Getty Images)
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(Newser) – Britain's surging rat population is becoming immune to common poisons, spurring public heath concerns and calls for stronger pesticides, reports the Guardian. Rodents in at least two towns are impervious to normal control methods. In addition, years of mild winters and wet summers have boosted vermin populations by 66% in some cities.