https://www.statnews.com/2022/01/19/those-who-recovered-from-covid-19-were-less-likely-than-vaccinated-to-get-infected-during-delta-wave/
https://www.statnews.com/2022/01/19/those-who-recovered-from-covid-19-were-less-likely-than-vaccinated-to-get-infected-during-delta-wave/