Immunization against A/H1N1 pandemic flu (2009-2010) in pediatric patients at risk. What might be the most effective strategy? The experience of an health district of Northern Italy.

Background: Vaccination coverage rates against pandemic flu were far below those required by Italian Public Health Authorities.The aim of this retrospective study was to assess how the management of vaccination against pandemic flu in the Health District of Piacenza (Northern Italy) had conditioned the adherence of patients at risk to the H1N1flu immunization program.

Methods: From a population of 27.