I think with a positive widal test you should be very careful & take complete bed rest for a month or so,as typhoid fever
is known for complications. It is better to get A BLOOD CULTURE
done, that would detect the pathogen in the blood.without which possibility of ceftriaxone
cannot be ruled out.Get a serum C-reactive protein
done to know the inflammation & later for prognosis of infection.i suggest you get a blood culture done preferably blood sample collected just before the febrile status & also just before the next antibiotic dose.Always keep a regular follow up with your clinician & inform about all changes.