Planning to travel to the US this summer and expect we might have been offered a first dose of Pfizer/Moderna/J&J prior to our trip in July, and will therefore probably miss our follow-up appointment.

Friends and contacts in the US have said they're vaccinating anyone who wants one where we're headed, so I'm confident we'd be able to get our second dose in the US, although I'm conscious this may impact our ability to get a vaccine 'passport' to show we're fully vaccinated, as neither country would be able to confirm that we've had the full dose of each vaccine.

The obvious solution is to try and get J&J, but I doubt this will be readily available before our trip and I suspect there may be a requirement to be vaccinated to enter the US this summer for VWP holders.

Any ideas on what the implications of this may be?