Table 3.

Summary of the main characteristics of the studies included in the systematic review.

Author	Study design	Year	N°	Aim of the study
Fortunato et al.13	Retrospective	2009–2011	2198	To assess levels of immunization and factors influencing adherence to vaccinations needed for HCWs in Puglia region.
Stroffolini et al.14	Retrospective	2006	1632	To assess the vaccination coverage against HBV in HCWs.
Copello et al.15	Prospective	2014	2661	To assess the risk of healthcare associated infections in HCWs of a Sardinian Local Health Authority
Campagna et al.16	Prospective	2013	32*	To investigate whether, how, and which vaccination underwent Sardinia Health Care Workers (HCWs) and the variability of policies in different Hospital Health Managements of the whole region
Campagna et al.17	Retrospective	2009–2010	32196	To evaluate the risk assessment, health surveillance and fitness for work of HCWs exposed to rubella, measles, varicella and mumps.
Cologni et al.18	Retrospective	2007–2012	4000	To determine the percentage of susceptible HCWs to rubella, measles, varicella and mumps infection.
Fedeli et al.19	Retrospective	1998–2001	333	To determine the proportion of workers employed in high-risk healthcare areas who are susceptible to measles, mumps, rubella or varicella.
Porru et al.20	Retrospective	2004–2007	4000	To evaluate the prevalence of HCWs susceptible to measles, mumps, rubella and varicella infection.
Esposito et al.21	Retrospective	2006	2240	A cross-sectional study of influenza vaccination coverage among HCWs as well as their knowledge of and attitudes toward influenza vaccination.
Alicino et al.22	Prospective	2005–2014	929	A comprehensive, multifaceted intervention project based on education, promotion, and easy access to influenza vaccination.

HCWs: Health Care Workers; HBV: hepatitis B virus;

^*Hospitals