"Relationship of the Influenza Vaccine (H1N1) and respiratory infections_x000D_ (influenza, pneumonia) in under 5 La Libertad 2009"._x000D_ For the development of the research information from the study was_x000D_ collected, "Risk of Vaccine-Preventable Diseases 2009," based on_x000D_ experience and on the global problem of pandemic influenza, it was decided_x000D_ to supplement the study the following research with the main objective of_x000D_ finding the relationship of the vaccine against the Influenza A (H1N1) and_x000D_ respiratory infections (flu, pneumonia) in children under 5 years, La Libertad_x000D_ 2009._x000D_ Out our population consisted children under 5 years (155.627 habt.)_x000D_ Obtaining a sample of 9 health facilities, of which 8.650 children participated_x000D_ in the study, using the technique of sampling by conglomerates systematic_x000D_ aleatory._x000D_ To find th...