Hi doctor, my son is 3 and half years old.from feb 1st week he got fever,for 5days..after 1 week 1 week also he got fever..but no antibiotics were given, only calpol and allerfin was taken..three days back he again got fever, and we did widal test it showed salmonella thyphi O 160 and salmonella thyphi H 160 and parathypi neggative...doctor told to wait for 2 days..we diidnt give him medicine.But after two days his fever slow down and he is active.he is not having diarhrea or not vomitting.Doctor told he is not having any symtoms..why the result showed positive.can u pls explain me abt it.Is it good taking thyphoid vaccination

Summarized question: What does Salmonella thyphi O-160 and H-160 indicate?