World Blood Donor Day 2022: Why blood donation is significant during the times of COVID pandemic?

Blood Donation Day: World Blood Donor Day 2022 serves as a call to action for the governments and the national health authorities for allocating sufficient resources to increase the collection of blood. 

source https://www.jagranjosh.com/current-affairs/world-blood-donor-day-2022-why-blood-donation-is-significant-during-the-times-of-covid-pandemic-1655179920-1