Poisonous bug

By Barry Fox Reckitt & Colman of Hull claims a breakthrough in pest control (GB 2 329 125). The rat poison warfarin, which has been used for 40 years, works by hindering blood clotting so the animals start haemorrhaging. In the 1970s, rats started to develop resistance to the poison, but inventor Richard Poch thinks this may not be genetic, as previously assumed. He says bacteria in the rats’ stomachs metabolise the warfarin before it can act. The patent proposes adding an antibiotic to the warfarin to kill the bacteria,
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