The flu is permitted to return.
And those who are vaxxed will no longer be sick or die with covid (because too many are starting to question the whole covid thing. Especially those who got 2 or more vaccines and are wondering why they're still coming down with covid.)
Those who are still unvaxxed? If you're sick, you'll be diagnosed with covid and shamed by society for being 'so selfish'. And if you die, it'll be because of covid and the media and self-righteous vaxxed karens have the 'privilege' of saying 'I told you so' over your graves. (because they 'care' about health.)
Purebloods have a better chance of survival.
The vaxxed have a lot of hurdles to overcome. Especially true if they go for boosters 3 and 4.