my son is 3months old and when he was 1month old he will go green mucus stools and we done stool culture test report is e.coli and pus cells are loaded hpf and we use zocef antibiotic there is no use again stool test is done mucus is present pus cells 8to10 hpf bacteria present we used walamycin antibiotic.there is no result again the mucus is present.now what we have to why the infection is not going