A bat found June 1 at the Upper Merion Swim and Tennis Club in King of Prussia has tested positive for rabies, according to Montgomery County health officials.Two people were bitten by the bat May 29, and are now undergoing post-exposure treatment. Others may have been exposed to the rabid bat as well, and health officials are advising anyone who thinks he or she may have been bitten to seek medical attention or alert officials by calling 610-278-5117.