Head lice have become immune to common medical treatments, according to new research.A study in the USA found high numbers of lice are becoming resistant to popular over-the-counter treatments used to kill the parasitesScientists report that lice in at least 25 American states are unaffected by the treatments still widely recommended by doctors and schools, as reported in the Telegraph.A head lice outbreak can be a nightmare for parents who often feel they are fighting a losing battle with the...
