I have no idea what "world.org" is and what it does as an organization. Does anyone have more information?

I ask because I don't see that many data to clearly support the link claimed in the title. Like the BCG vaccine discussion, this needs far more investigation as far as I can see.

I'm sceptical. The Belgian deaths the paper refers to are being misrepresented. Belgium is overreporting deaths, compared to many other countries' underreporting. Drawing any conclusions from those numbers does not shine a positive light on the quality of the paper.

Only 0.5% of Belgian deaths are under 45y/o. About 80% of the reported deaths are in people over 75. If the MMR vaccine offers protection, and people weren't vaccinated until 1995, I'd expect to see more cases in the 30-45 age bracket. But its virtually empty.

But then there is a paper from 2014 [1] where the authors were looking into a a SARS-CoV (not SARS-CoV-2!) vaccine based on a measles/rubella vaccine, so maybe there is something to it.

That being said, the lack of updates about this probably isn't a good sign.

[1] https://doi.org/10.1016/j.virol.2014.01.002