show Abstracthide AbstractMutations in TLR1 have been found to be associated with leprosy in humans and armadillos. In this study we sequenced the TLR1 coding sequence of red squirrels from the British Isles. We compared red squirrels infected with leprosy-causing bacteria (Mycobacterium leprae or Mycobacterium lepromatosis) with PCR-negative squirrels.