Objectives: To present the criteria used to define a vaccination schedule for childhood and adolescence, comparing the recommendations of national and international excellence institutions.

Objectives: To estimate the prevalence of anti-hepatitis A virus (anti-HAV) antibodies in serum samples from children and adolescents obtained at two clinical pathology laboratories in the city of Porto Alegre, south of Brazil, and to compare findings to those of a study carried out in the 1990s.