“…Prior research has thoroughly investigated immunization coverage of recommended vaccines for HCWs and found significant immunity gaps occur among HCWs, especially for measles and influenza [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. To reduce the immunity gap, there is an ongoing debate on mandatory vaccination approaches for HCWs in European countries, the USA, and others [ 5 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. The ethical dilemma represented by the mandatory vaccination on HCWs is the balance between HCWs’ autonomy and patients’ welfare, public health, and HCWs’ own health interests [ 14 , 22 , 23 , 24 , 25 ].…”