title: Public health surveillance and data collection: general principles and impact on hemophilia care.
abstract: Public health surveillance is the ongoing collection, analysis, and dissemination of health related data to provide information that can be used to monitor and improve the health of populations. Such surveillance systems can be established in many settings to study  a variety of populations and conditions. The most effective systems are designed around specific, well-defined objectives, collect data in a standardized fashion, analyze the data frequently, and disseminate the results to those who need to know the information. Surveillance has been used  to determine the occurrence rates of hemophilia and to characterize the population affected by this rare but potentially serious congenital disorder. Data from surveillance systems have been used to identify risk factors for complications that, once identified, have been modified through public  health interventions. The effectiveness of these interventions can be assessed by continued surveillance, thereby assuring improvement in care of people affected by hemophilia around the world.
authors.affiliation: Centers for Disease Control and Prevention, Division of Blood Disorders, National Centers for Birth Defects and Developmental Disabilities, Atlanta, GA 30333, USA. msoucie@cdc.gov
authors.forename: J Michael
authors.initials: JM
authors.lastname: Soucie
mesh_terms: D003191:Comprehensive Health Care / Q000379:methods; D003625:Data Collection / Q000379:methods*; D006467:Hemophilia A / Q000453:epidemiology* / Q000628:therapy; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D011634:Public Health / Q000379:methods