Thank you for your query on Healthcare Magic.
Relapse (reoccurrence of fever) is a frequently seen problem with Typhoid fever
But the child needs complete physical examination and investigations like widal test
to look for increasing titers of antibodies
to confirm it a relapse.
If it is confirmed the relapse again IV antibiotics have to be continued for an appropriate duration.
And child needs other investigations like CBP,CUE, Malarial parasite to look for the other causes of fever.
So consult your Pediatrician
for examination, investigations, and for appropriate treatment.
Hope I have answered your query.