For example, many studies identify nurses as a group that is particularly resistant to influenza immunisation, 34, 55, 62 and others have targeted HCWs working in specific settings, such as nursing homes, oncology centres or paediatric units. [76] [77] [78] The focus on specific subgroups of HCWs, especially those in closest contact with high-risk populations, has been noted in the literature as an important step to a better understanding of the concerns among HCW groups.