I was making another meme not as a reply to your comment, but as a meme to other comments.
General quarantine would explain if the amount of flu cases were merely a decrease or decline, but the flu has virtually been non-existent. In 2020, only about 100 people died according to the CDC, when usually each year about 35,000 die from the flu. Also, currently according to the CDC, there's only 1500 cases nationwide, when there's usually millions of cases. For a disease that has been around for 1000s of years to all of a sudden vanish when all of the usual contributing factors have happened in the past, like we didn't used to travel on planes and people did use to work from home, when we everyone was farmers, etc. If the flu is truly gone, that's great, but I'm surprised that medical researchers are not talking about how big of a deal this is!