Yep. This was always the logic for annual flu vaccinations. It also slows down the spread and makes it unlikely that an entire family unit, or organization, will all be bowled over at the same time. It's NOT at all a guarantee that you won't get the flu.
The most reasonable assumption is that it works the same for the Made in China virus. Mark has kept up with his vaccinations and recently got a booster. Now he'll get the natural immunity that man of us talked about, but with the disease itself being manageable and much less dangerous.
Thank you for your insight.