Comment by lithocarpus

That's a good point. I would like to see long term problems from measles infection studied and better understood, but I also understand how they really can't be studied in the US where measles is extremely rare and I wouldn't advocate bringing it back to find out.

It is similar with covid but I wouldn't say it's quite the same. The measles vaccine seems very effective at preventing infection, while the covid vaccine is not. It might reduce harm from the infection, and whether this reduction in harm outweighs potential harm from the vaccine is not well understood. It may have done so early on when covid itself was more dangerous, and it might not with current strains of covid. I would similarly like to see long term studies comparing two similar populations where one took the vaccine and the other didn't. It's complex.

With covid, in the beginning there simply wasn't time to know if the vaccine was safe. And now that we've had some time, it turns out that longer term placebo controlled studies just were never done, so we still don't know. Once it became clear that the vaccine was very ineffective at preventing infection the choice became a lot easier - get the virus, or get the virus and the vaccine, which are categorically different things.

I'm not happy to get either of them, but I'd rather the one than both. The virus itself appears to have been modified and was certainly novel to humans. The vaccines are novel and hard-to-understand in many many more ways than.

There is also a point to be made about the body being a complex system and introducing novelty to a complex system can have consequences that are unpredictable and hard to understand. Still worth studying though.