The personnel involved in the Fiera Milano city pediatric center is composed by 4 different figures: doctors, nurses, pharmacists and receptionist. The four professional figures report each to a person in charge, who can always be contacted during the vaccination activity. In the vaccination modules, doctors are responsible for anamnesis, vaccination eligibility, vaccine administration, and recommend the waiting time needed after the inoculation. The average time to carry out the vaccination is 6 minutes, and each doctor therefore concludes about 10 vaccinations per hour. Nurses attend the vaccine dilution and the syringes preparation, as well as supporting doctors during the administration, as it may be difficult in children. Pharmacists manage the vaccines displacement from the stock areas to the vaccination lines and their storage at the right temperature. In the reception desks, receptionists check the vaccination candidate’s identity and their reservation. Furthermore, Civil Protection volunteers and local hospitals associations volunteers are also part of the personnel in force in the Center. The first mentioned direct the flow of people through the mandatory path between the entrance and the modules, ensuring that no crowds are formed in these areas; the others are recruited to entertain the children during their permanence in the MCV. The personnel are provided with information material, constantly updated according to the latest indications from the Minister of Health, and online courses and lessons are also guaranteed. All staff are also provided with an operational instruction, specific to the professional figure, in which national and regional guidelines on vaccination activity are summarized. Moreover, the new hires are placed alongside to expert personnel on their first shift.