They tried the Mass vaccination 2-3 times before, but it was just a flu they used as a threat and ordinary hospitals and medical care weren't brainwashed as with Covid19, so SARS1/H1N1 didn't get the traction they wanted and not Bird flu or the Swine flu. but to make Covid-19 to spread they had to kill Ivermectin (that Joe Rogan took amongst millions) here is a documentary about how big Pharma made it all about the deadly vaccine instead : https://rumble.com/v1huyrn-ivermectin-the-truth.html