We can definitely minimize Covid-19 risk by using sanitizer capable of covering surfaces with self-sanitizing coating. Virol-Oxy is a good example of such sanitizer. Virol-Oxy is made in Germany and capable of providing extended protection against virus, bacteria and fungi with only one spray. It's also safer than other conventional disinfectant/sanitizer because it's not flammable and doesn't cause skin irritation. Our kids are also using Virol-Oxy on their hands whenever we go out. I'm currently spraying this at our offices on weekly basis. The cost is minimal because a litre Virol-Oxy cost as low as Rp12.500 or US$0.86. This is way more affordable and safer than other disinfectant/sanitisers sold in the market. So it's worth looking into it because we have been using this since early 2021.
UVC air purification system can also be combined with such advanced sanitizer to further minimize Covid-19 risk. I read in a literature that if air in a room can be disinfected at least 5 times per hour, the risk of Covid-19 becomes very low. But the question is, will international schools invest in such equipment to reduce Covid-19 risk.
Reads a bit like a promotion to me. Do you have an interest in it?