However, in contrast of the common grippe that costuma to present light clinical picture and to evolve for the cure, the Influenza It can cause the atony and provoke the death of patient. 1,6 Writs of prevention Had to the great danger of this pandemic if to spread in Brazil and to vitimar many people, the Health department, aiming at to reduce the contamination for virus H1N1, developed a preventive program and implanted, in the year of 2010, the National Strategy of Vaccination Against the Virus of Influenza Pandmica (H1N1) 2009. This action was successful, therefore it was based on the analysis of some factors, such as the situation epidemiologist in Brazil, the validity of the second wave of the pandemic in the hemisphere north, the gravity of the illness, the risk of adoecer and dying and the availability of the vaccine. On the gravity of this pandemic in domestic territory, the Health department (2010) affirms: According to bulletin n 88 of the World-wide Organization of Sade (OMS), available in the site, up to 19 of February of 2010, more than 212 countries has cases confirmed of influenza (H1N1) 2009, with, at least, 15,921 deaths. (BRAZIL, 2010, P. 3) the pandemic was divided in two phases distinct operational epidemiologists and: the phase of containment and the phase of mitigao. In summarized way, them thus they are characterized: Phase of containment: period where the virus was if spreading in the world and the cases is related to the international trips or contact with sick people who have carried through international trips. In this phase, it had action of monitoring in entry points of the country, that is, in ports, airports and tickets of border. In accordance with the Health department (2010): Epidemiologicamente, this phase understood of the week epidemiologist (IF) 16, period of identification of the first suspected cases, IF the 28, period of the declaration of supported transmission.