Age Factors Child Child, Preschool Community-Acquired Infections--epidemiology Cross Infection--epidemiology Health Services Needs and Demand--statistics & numerical data Hospitals, Pediatric--statistics & numerical data Hospitals, University Humans Infant Infant, Newborn Infection Control Nova Scotia--epidemiology Patient Isolation--statistics & numerical data Patients' Rooms--statistics & numerical data Prevalence Prospective Studies Seasons Surveys and Questionnaires