[A national epidemiologic surveillance service. Its importance for the scientific approach to health activities].
D003140:Communicable Disease Control; D003906:Developing Countries; D004812:Epidemiologic Methods; D006801:Humans; D009934:Organization and Administration; D011635:Public Health Administration
Un servicio de vigilancia epidemiológica nacional. Su importancia para el enfoque cientifico de las actividades sanitarias.