I got my shingles vaccine in late summer (1st dose) and December, and got boosted for Covid in-between. I had no idea that was a no-no. Why is that?My friend is 50 and in good health. He and his wife got vaxxed in March. In late summer he decided to get the shingles vaccine, and when the boosters came around, he was still in the window on his shingles vax and couldn’t get boosted.