Northeastern University researchers have found that the bad­terium that causes Lyme dis­ease forms for­mant per­sister cells, which are known to evade antibi­otics. This sig­nif­i­cant finding, they said, could help explain why it’s so dif­fi­cult to treat the infec­tion in some patients. “It hasn’t been entirely clear why it’s dif­fi­cult to treat the pathogen with antibi­otics since there has been no …