i think my rats RI is gone

Hi i think my rats RI is gone he barley sneezes and is back to old ratty self just has a light sneeze as does the females. is it ok to move them back together? i thin they will be fine. he made a major improvment on his sneezing since i switched from pine bedding to aspen bedding. please respond ASAP

Im sure it would be fine to put them together.
Pine is pretty dusty so im sure they will be fine together on the aspen.