1 AMR Clinical Reference Center, Disease Control and Prevention Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan Department of Emergency and Critical Care Medicine, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan, All the authors belong to the KOKETSUKIN pediatric blood culture education group Department of General Pediatrics, Aichi Children's Health and Medicine Hospital, Aichi, Japan Department of Infectious disease, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan Division of Infectious disease, Department of Pediatrics, Kobe Children Hospital, Hyogo, Japan.