I thought 2 doses and a booster would protect me from getting Covid. I haven’t gotten Covid but I’ve recently had a very close calls. Four good friends of mine were vaccinated and all got Covid-19 in January. Three of them were at a family reunion with me. The good news is all of my friends recovered quickly and did not need to go to the hospital.
But, it was scary. Trump commented that Covid vaccines work because they keep you out of the hospital. Well, in general. One of my friends said she was having trouble breathing. She has two young children to take care which were unvaccinated. I tried to help her by preparing food for her and her kids. She improved greatly after 3 days of bed rest.
Lots of health related issues can make a mild case go to a severe one. Respiratory diseases like emphysema and asthma are obvious issues. Diabetes and obesity also put people in the high risk category. The list of risk factors is long.
Tests are free in the US, but not in many countries. So, I believe the current level of Covid cases outside the US is very under reported.
People want to travel to visit with family and friends. I think when staying in someone’s house, it is not an impolite question to ask if they have been vaccinated. Also, it is very understandable why we need Covid tests for international flights in and out of the US.
Your first line of defense is to be vaccinate. You are much more protected if everyone you contact is also vaccinated. Still, nothing is full proof with this disease.