> .. what were you doing in 2020?

Waiting several years for widespread vaccine availability, and practicing good hygiene and social distancing.

Viruses aren't so good at seizing and holding territory.

> Viruses aren't so good at seizing and holding territory.

Neither is infantry that's sick with the flu, which may have been a factor in the ending of of WWI.

Tis hard to practice good hygiene and social distancing in the trenches.

If one side had better access to vaccines or access to better vaccines in a conflict during a pandemic, it would be significant, regardless of how the pandemic came about.

As I recall, the economic damage of the pandemic was ~ "it's worth spending ten billion dollars to make the vaccinations arrive one day sooner": https://www.newsweek.com/operation-warp-speed-what-deal-opin...

(And that was just the cost to the USA, not the world as a whole).