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<p>As of 21 November, over 15.3 million third doses have been administered across
the United Kingdom.</p><p>In England, there are now more sites than ever delivering
COVID-19 vaccines, including hundreds of walk-in sites. The National Booking Service
has been updated, allowing people to pre-book their appointment and receive their
booster dose as soon as they become eligible.</p><p>We have also launched the Boost
Your Immunity This Winter media campaign, which emphasises the importance of booster
vaccinations.</p>
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