A high viral dose exposure, a bad mutant variant, or an immune system compromised by prior illness or chemotherapy — are 3 potential reasons why COVID reinfection or post-vaccine infection may occur.
Lowering viral dose exposure can be achieved by masks, distancing, ventilation. I think it's a good idea to follow these measures until the pandemic is under control in your country, even if you have had prior COVID and are vaccinated. Helps you. And helps reduce spread to others
Immune system thats compromised by prior illness or chemotherapy can be helped by ongoing research on vaccine boosters. As well as improved treatments. But note that no matter how immunosuppressed, whatever protection we get from vaccines is definitely better than nothing.
The rise of bad mutant variants can only be addressed if we look at controlling COVID from a global perspective. COVID raging in any part of the world has consequences for everywhere else. COVID doesn't know geography or politics. So we must make sure the world is vaccinated.
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