What Causes Numbness In Leg While Having Typhoid Fever?

Dear sir,I am from Bangladesh.Last 10 month ago my sister was affected in typhoid fever.One day he was going to doctor and eat medicine.Next day at morning his left leg were senseless. There is no sense in his left leg & now the situation is same.We was going to a doctor of neurosurgeon in Dhaka and do some test like CT scan and MRI but there is no problem in MRI & CT scan report we are found now please tell me about my sister problem and oblige thereby sir.MARUF AHMED