It unfortunately doesn't work because people in general don't get that knowledge progresses and what may previously been considered a truth, no longer is - and that should be how it works because we learn and grow as a civilisation.[1]
But it's not - people don't accept that what they were told previously is no longer correct. A good example is the current arguments around mask wearing. By originally saying don't wear masks, that has stuck and a lot of people think either you lied originally or you don't know what you're talking about - ideas made worse by being promoted for political gain.
In places like Japan you are expected to wear a mask if you're sick, so there's no reason that shouldn't become standard in the West.
More important could be that workplaces require staff to either stay home and not infect the office when they have the flu, or wear a mask if they have to go in.
If you're a casual employee and don't have any sort of paid sick leave you either turn up or forgo the money (and potential future work). There are also those who pride themselves on never taking sick leave and "soldiering on", but invariably infect their coworkers. Here's some survey stats:
But it's not - people don't accept that what they were told previously is no longer correct. A good example is the current arguments around mask wearing. By originally saying don't wear masks, that has stuck and a lot of people think either you lied originally or you don't know what you're talking about - ideas made worse by being promoted for political gain.
[1] https://en.m.wikipedia.org/wiki/Half-life_of_knowledge