I have suspicion that I actually infected as well, I got a super bad headache and dizzy last week, my blood pressure went a bit high, but now everything back to normal, just still have some headache sometime but it's not as worse as I did last week.
If you sister has done for 2 or 3 dose vaccines that should be ok, she should have protection, no worry
Yeah, most of us are vaccinated at least twice. There are still people who aren't even vaccinated to this day, like my grandma due to her comorbidity. But I hope everyone is safe! you too. Have a great day.