Although fully vaccinated, staying out of stores, using Walmart pick-up into my trunk for groceries, pharmacy delivery for meds, curbside pick-up to back seat for restaurant food now and then, and faithful masking/distancing, no visiting indoors- I got break-through COVID- sick, sick, sick. Luckily was eligible for IV monoclonal antibodies, got better fast. Gave it to my husband, despite isolation and all precautions, he was also eligible also for the IV, got it on Day 2, symptoms very mild.
In our area now, the IV antibiotics are very precious- my rheumatologist told me 2 wks ago while at appt, that if you are eligible, you go into a lottery pool, if you are picked, you have to go to the main hospital of the health system (2 hour drive away) to receive the IV. Maybe check how it is in your area before declining the booster. CDC/my PCP says you have to wait 90 days after IV treatment to receive booster, we’re signed up for next week.