BSB's rep tells TMZ, A.J. -- who was recently diagnosed with the leaky eye infection -- is "doing fine" ... and the band's current tour will go on as scheduled.
As for the other guys -- we're told the rest of the band was inspected by a doctor as soon as they discovered A.J.'s pus problem ... and they all tested negative.
No word on who farted on A.J.'s pillow.
