Vaccination coverage after the introduction of mandatory law: results from an Italian Southern Region

Background Over the latest decades, Europe has been facing the spreading of vaccine hesitancy. This growing phenomenon has resulted in decreasing vaccination coverage all over Europe, particularly in Italy for measles, mumps and rubella. In order to face up this problem, in 2017 Italy introduced compulsory vaccination against 10 different infectious diseases: diphtheria, tetanus, pertussis, polio, hepatitis B, haemophilus influenzae B (all included in the hexavalent vaccine), measles, mumps, rubella (included in the MMR vaccine) and chickenpox (from the 2017 cohort). The aim of this study was to evaluate vaccination coverages in 2019 in Abruzzo, an Italian Southern Region, after the introduction of compulsory vaccinations. Methods In this study the following indicators were taken into account: vaccination coverages at 24 months of age (2017 cohort of birth), vaccination coverages at 36 month of age (2016 cohort), vaccination coverages at 5/6 years of age (2013 and 2014 cohorts) and vaccination coverages at 16 and 18 years of age (2001 and 2003 cohorts). Vaccination coverage rates were calculated as the number of vaccinated patients for each disease over the total number of patients born in the year considered. Results At the end of 2019, the 2017 cohort reached 95% coverage for all vaccinations except for chickenpox (87.9%). Conversely, the 2016 cohort showed low rates for MMR and chickenpox, up to 90.8% and 52.1% respectively. Additionally, 2013 and 2014 teenager cohorts showed coverage rates lower than 95% for all the compulsory vaccinations. Conclusions After two years of mandatory vaccination law in Italy, vaccination coverages have reached the 95% threshold only among patients of 24 months of age. Older cohorts still show inadequate vaccination coverages despite the introduction of mandatory vaccination law. Health services at regional level should develop policies and strategies aiming to improve vaccination coverages and to reach herd immunity. Key messages After the introduction on mandatory vaccination, vaccination coverages reached the 95% threshold only among patients of 24 months of age. Health services should develop strategies aiming to improve vaccination coverages.