Covid-19 appears far more lethal than flu based on antibody test results – The Washington Post

April 28, 2020

https://www.washingtonpost.com/health/antibody-tests-support-whats-been-obvious-covid-19-is-much-more-lethal-than-flu/2020/04/28/2fc215d8-87f7-11ea-ac8a-fe9b8088e101_story.html