COVID-19 testing and vaccine rules for entering the U.S.As of June 12, 2022, people entering the U.S. no longer need to show proof of a negative COVID-19 test.
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British nationals are required to must have an ESTA travel authorization in order to enter the United States by air or sea without a visa for tourism, business, or transit.
Adults need a tetanus shot (tetanus booster) every 10 years. A booster shot is another dose of a vaccine that you get months or years after a previous dose.
This means that, at least in theory, an overseas national can leave the UK following a full 6-month visit, re-apply for a visa from overseas and subsequently return to the UK, even if this is just a few short weeks later.