The first 60 days: American public health agencies' social media strategies in the emerging Covid-19 pandemic

This paper captures, identifies , and describes the patterns of longitudinal risk communication from public health communicating agencies on Twitter during the first 60 days of the response to the novel coronavirus disease 2019 (COVID-19) pandemic. They  collected 138,546 tweets from 696 targeted accounts from February 1 to March 31,2020, employing term frequency-inverse document frequency to identify keyword hashtags that were distinctive on each day

The research  found that longitudinal risk communication in response to the COVID-19 pandemic shifted as secondary threats arose, while continuing to promote pro-social activities to reduce impact on vulnerable populations. Identifying patterns of risk communication longitudinally allows public health communicators to observe changes in topics and priorities.