This story is republished from STAT, the health and medicine news site that’s a partner to the Globe. Sign up for STAT’s free Morning Rounds newsletter here. An experimental vaccine from Pfizer and Valneva reduced the risk of developing Lyme disease by more than 70 percent, according to newly released data. Though results appear to have missed a key statistical bar, the companies said they would still be approaching regulators in hopes the vaccine would be approved.