I’m holding out for a one shot ‘fix’, probably the J&J vaccine.. we’ll have to see what cruise lines require.
Most folks today are doing the ‘Faux Xi’ two-shot shuffle, if any vaccine is even available, that is.
I’m sure wealthy EUros will get their shots.
The 2nd shot of Moderna vaccine is identical in size and chemistry with the 1st shot. After 11 days of receiving 1st shot I have zero side effects. (Age 80 & 10 months).