#AskTheExpert . Hello sir. my son is 4 years old and 6 months back he had blood infection saying that e.coli bacteria is there in his blood and he went through IV antibiotic treatment.. again now he had fever and doctor has asked us to go for blood, urine tests and blood culture.. the blood tests reports have come and his CRP is 15 and ESR is 45.. is there any chance that he may get the blood infection back?