Interesting. From the Mets Citi Field:

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"Ticketed guests 2 years and older will need one of the these:

Full vaccination (at least 14 days prior)
Negative PCR COVID test (within 72 hours)
Negative Antigen test (within 6 hours)

For more info about COVID testing & proof of vaccination":

https://t.co/bSxZoasLrd https://t.co/BteSFGYDsx

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https://twitter.com/Mets/status/1378357136141524998?s=19