Stewie soon becomes unwell .
Stewie soon is informed that he must be quarantined and kept in a germ - free environment by a doctor for the time being until his immune system 's strength recovers at the end of the episode .
Stewie soon becomes unwell and is informed that he must be quarantined and kept in a germ - free environment by a doctor for the time being until his immune system 's strength recovers at the end of the episode .