Hello. Welcome to HCM.
I am Dr Jigar(ID Specialist). I will be helping you in this matter.
If i was your treating doctor then i would have gone for following things:
1) Serological diagnosis of typhoid has limitation. Your doctor should go for
Blood culture for
salmonella which is the gold standard for the diagnosis and it will also confirm to which antibiotics it is sensitive and responds.
2) Chloramphenicol is one such drug which should not be used when other safe drugs are available. As it has many manageable and some severe side effects (e.g
bone marrow suppression). In your case it should not be used at least in second time of illness.
3) for current illness my recommendation is do
complete blood count and other blood tests after consulting a Infectious disease specialist to rule out side effects of chloramphenicol.
Vaccine do not cause such illness. If typhoid is confirmed then do not go for the same drug again.
4) Give patient plenty of fluid, good nutritious diet and fruits.
I hope i have justified it. I wish rapid recovery of the patient. Do not hesitate to ask for future help.
Regards.
Dr JIgar.