Data collection The data obtained for all infants included: demographic information (age at admission, gender, and birth weight), general assessment (well or sick-appearing), medical history, physical examination findings, laboratory test results, and final diagnosis. Laboratory investigations including complete blood count, CRP level, blood chemistry and culture, urine sample analysis and culture (obtained by bladder catheterization), and cerebrospinal fluid sample analysis and culture, were carried out. In the presence of respiratory symptoms or signs, chest radiography was performed. Lumbar puncture was performed according to the ward's policy, which is required for every infant if neurologic findings are positive or without the focus on fever. Stool specimens were obtained when a history of diarrhea was noted and sent for white blood cell analysis and bacterial culture. Other tests were conducted as necessary. Skin, soft tissue, and ear infections were diagnosed by physical examination.