Prove he had it
Simple.
If you make past 58 you’ll live to 63, if you make it past 63 you’ll live to 68, if you live past 68 you’ll live to 72, if you make it past 72 you’ll live to 78...
If your from India and you live past 10, you’re immune system has the strengh of 7 elephants.
Simple math
All major league team announcers had to be full vaccinated if they worked on site in any stadium, which he did. This is why there were issues with John Smoltz and Paul O'Neill broadcasting for the World Series and Yankees respectively, among others who wisely refused the jab.