2 months old fever again after discharge from hospital for fever

My 2 month old has fever (38-39) from last wed morning, after vaccinations in tues. The fever persisted and we brought to kkh last Thur afternoon. Baby was hospitalised, panadol given once when above 39C, and the rest was using fever cooling patch and cooling mat to lie on. Tests were done, cultures neg, csf neg, only nose swab adenovirus was positive. Baby was given antibiotics on Fri and sat just in case, and fever ceased sat early hours. Discharged on Sunday morning, but Sunday evening her fever came back. Now Monday morning fever still persist Should I go back to kkh? #Needadvice #FTM #2mobaby #feveragain