[2 Seroprevalence Study in Spain, 2017-2018].

Vaccination programmes are one of the public health measures that have the greatest impact on reducing the burden of disease, mortality and associated costs of a large number of communicable diseases. The success of vaccination is due to the use of highly effective and safe products, but also to well-functioning surveillance systems and epidemiological studies realised. Seroprevalence studies or surveys are a powerful assessment tool providing accurate information on the frequency, distribution and dynamics of communicable diseases. More than 20 years have passed since the first study was carried out in Spain, and this second seroprevalence study is essential to know the impact of vaccination programmes and the prevalence of immunity of the general population against immunopreventable diseases and other diseases of public health interest. The pathologies included in the study are: poliomyelitis, diphtheria, tetanus, pertussis, measles, rubella, mumps, varicella, invasive meningococcal serogroup C disease, hepatitis A, hepatitis B and D, hepatitis C, hepatitis E and human immunodeficiency virus (HIV) infection. Despite the current pandemic, this information can be used by technicians and decision-makers to adjust existing vaccination programmes and contribute to improving the health of the population in our country.