Health risk communication during Covid-19 emergency in Italy: the impact of medical experts’ debate on Twitter

The COVID-19 emergency underlined the importance of an effective public health communication to limit the spread of the outbreak. Physicians as "public experts" can play a crucial part in health risk communication, even if their role is challenged by transformations into the information system. Therefore, the major objective of this study was to investigate public perception of medical experts' opinions regarding the COVID-19 emergency. The Italian public debate involving medical experts in the Twitter sphere during the SARS-CoV-2 pandemic has particularly been examined. A content analysis was performed on 2,040 randomly selected tweets. The results of content analysis show that the medical experts who tend to mitigate the risk received a higher number of tweets supporting their positions when compared to the experts whose statements were aimed at intensifying the risk. Since a public expert is a communicator, but also an advisor who can affect how laypersons perceive and react to risk events, this study can provide more knowledge about the public perception of different communication strategies incorporated by medical experts