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Vaccines are biological products designed to induce a protective immune response, mimicking natural infection without the development of disease and / or complications. Combined vaccine administration and vaccines co-administration is a safe and effective practice, the benefits of which outweigh the disadvantages. The operators should assess individual variations for the completion of the vaccination schedule, which may be necessary in clinical practice, case by case. Often there are myths to dispel, such as fears about the overload of the immune system, the remora to do more injections in the same session, excessive reactogenicity and some false contraindications. The operators, in order to resolve their doubt in performing non-routine co-administrations, can rely on the Summary of Product Characteristics (SPC) of the individual vaccines and on the new available evidence.

The hospital as a work environment is particularly characterized by various risks for healthcare workers (HCWs). The main risk is represented by biological accidents, associated with the parenteral transmission of pathogens. Biological injuries can occur during the care service and the manipulation of biological fluids. Hepatitis B (and hepatitis D), hepatitis C and HIV are the most common infections transmitted by biological injuries. Physicians should acquire awareness of the risks associated with their professional activity during their training as medical residents (MRs). Some infectious diseases are preventable by vaccination and the "National Immunization Plan 2017-2019" (PNPV) recommends HCWs vaccination against hepatitis B, influenza, measles -mumps -rubella, chicken pox, and pertussis. Besides, not only HCWs' vaccination can prevent the disease in healthcare professionals, but it also may reduce the transmission to patients. Therefore, active immunization of HCWs by recommended vaccinations plays an important role to prevent disease cases, complications and death in patients. An increased awareness of risk behaviors is the first important point to address in order to reduce biological accidents and infectious diseases transmission, so as to reduce their frequency. Besides, HCWs' vaccination is useful to reinforce protection and to prevent the transmission of some infectious diseases in case of exposure. The aim of this five-year incidence study is to investigate the MRs' biological accidents characteristics and to analyze the MRs' immune status at the University of Ferrara in the period 2011-2015. Data on MRs' biological accidents and immune status at Azienda Ospedaliero-Universitaria of Ferrara in 2011-2015 were analyzed by Microsoft Excel 2007 Software. In this study, the percentage of MRs' biological injuries compared to the total number of MRs showed an annual variability, with a peak in 2011 (11.9%). During the analyzed period, there were 190 biological injuries among the MRs: 81% were percutaneous injuries and blood was the biological fluid involved in 86.3% of cases. The most frequent lesion was puncture (62.6%), occurred in 41.1% of cases by suture needles; 46.3% of accidents occurred in the operating block. These data can be explained by the more invasive and at risk activities carried out in these Operative Units. The high injuries percentage in MRs may be related to less work experience and inadequate training or informations about personal protective equipment use. Among MRs, 93.7%, 93.3% and 96.6% were immune to measles, chicken pox and hepatitis B, respectively; only in the case of rubella, 11.9% of MRs was not immune. This research showed, accordingly to published data, high adhesion to hepatitis B vaccination. However, the healthcare workers' vaccine coverage is still sub-optimal; active immunization by recommended vaccines should be implemented for both parenteral and airborne diseases. As a matter of fact, the recent measles outbreak has involved healthcare workers (4689 cases of measles, 305 in HCWs). Finally, the General Directorates of Health-care settings should improve healthcare personnel adhesion to vaccinations, such as influenza, by promotion activities in the workplace. A proposal in order to achieve coverage objectives could be making vaccinations mandatory, as well as already implemented in other countries.