I already require that all guests are vaccinated, with no exceptions, and if guests don't send me their vaccination records, I will cancel their reservation. I am hoping Airbnb will add an easy feature to allow guests to upload their vaccine records, and hopefully verify them, so we hosts can have an easier time if we want to protect ourselves by accepting only vaccinated guests into our homes. I don't let unvaccinated friends our family inside my house, I am certainly not willing to host unvaccinated strangers.