Yes. Abscess could be the cause of fever, it might not have completely resolved previously. I would suggest to get alteast a good ultrasound
of abdomen done to look for abscess. Other causes of fever like malaria
also need to be ruled out. When the abscess was drained , cultures would have been sent to known which organism is growing and which antibitoic would respond to that.. if the abscess has recurred culture reports need to be reviewed to see which antibiotic he will require.