A total of 10.8 million people have now received both jabs – the equivalent of 20.5 percent of the adult population. Wales is estimated to have given two doses to just under a quarter of adults (24.7 percent), ahead of Northern Ireland (20.5 percent), England (20.3 percent) and Scotland (19.1 percent).
The Prime Minister said: “We’ve reached a significant milestone with one in five adults now having had two COVID-19 vaccine doses.
“This is a huge UK-wide effort that has already saved thousands of lives.
“Thank you to everyone involved.”
The figures are for vaccinations reported by the UK’s health agencies up to and including April 20, and reflect the pace at which second doses have been ramped up across the country during the past month.
Some 2.6 million second doses were recorded in the seven days to April 20, with 6.3 million since April 1.
This compares with 3.7 million second doses in March and just 322,000 in February.
Second doses of Covid-19 vaccines must follow within 12 weeks of the first, meaning the millions of people who received their initial jab in January and early February have recently had a follow-up dose, or are due to get the jab shortly.
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People aged 80 and over were among the first groups on the priority list for vaccines, with initial doses offered from early December.
Figures published last week by NHS England suggested around three-quarters of people in England in this age group have now had both doses of vaccine.
In Wales, 78 percent of people aged 80 and over are estimated to have had both jabs, along with 80 percent in Scotland and 42 percent in Northern Ireland.
Wales leads the field in both first and second doses of vaccine, with more than two-thirds of its adult population having received the first jab (67.9 percent), followed by England (62.8 percent), Scotland (62.1 percent) and Northern Ireland (60.3 percent).
She continued: “The progress is a direct result of a combination of NHS teams who know and understand their communities, community and faith leaders who’ve worked really closely with us, practical considerations about Ramadan and other local nuances, and really strong vocal backing from high-profile people such as Bake Off’s Nadia Hussain, comedian Lenny Henry and TV star Adil Ray.
“So I want to thank everyone involved in this effort. You’ve saved lives.”
Dr Kanani said the NHS will keep offering first jabs as supply allows.
She said: “We want to make sure that nobody is left behind.
“So I want to urge everyone eligible to join the millions already vaccinated to protect yourselves and others.”