It would ALSO explain why old people are having severe complications. Nursing homes and long term care facilities make them mandatory since patients live close together. And old people have it drummed into them every time they go to the doctors. Pneumonia, flu, shingles.
If you got the flu shot this year and got covid, you had more complications than someone who didn't get the flu shot this year. Where was this year's flu shot made?
There were a couple different ones available for this season. selected table snap for 65+ indications.
https://www.cdc.gov/flu/season/faq-flu-season-2019-2020.htm
https://www.cdc.gov/flu/professionals/vaccines.htm
Sequiris is in UK, NC in US, Australia
Sanofi Pasteur is out of France