In England, an estimated 54.9% of the population had Covid antibodies in the week to 28 March, the Office for National Statistics says.
That number was 49.1% in Wales, 54.5% in Northern Ireland and 46% in Scotland.
The US, South Africa and European Union pause the Johnson & Johnson vaccine rollout after reports of rare blood clotting.
The US Food and Drug Administration says six blood clot cases were detected after more than 6.8 million doses of the vaccine were administered.
Johnson & Johnson says that "no clear causal relationship" has been established between its vaccine and the clots.
A leading statistician says data supports PM Boris Johnson's claim lockdown, not vaccines, was the major cause of the UK's fall in cases.
A UK trial looking at whether different types of jabs can be used for first and second doses hopes to recruit more volunteers.
So far more than 32 million people in the UK have received a first vaccine dose, while 7.8 million have had both doses.
The delay in rolling out the Johnson & Johnson vaccine is proving a headache for European governments that are relying on it to meet national vaccination targets.
Spain’s vaccine programme has started slowly and it was expecting 5.5 million doses of the Janssen dose (as it is known in Europe) by the end of June. Belgium received its first delivery of the single-dose vaccine on Monday – it says it’ll wait for a “clear signal” from the EU’s medicines agency before deciding which age group will receive it. German immunology expert Carsten Watzl wants the government in Berlin to focus on securing other vaccine deliveries to ensure under-60s are inoculated.
Lockdown in France has led to “significant and immediate health benefits” from a fall in pollution levels, according to the SPF public health agency. There has been an estimated fall of 2,300 deaths from exposure to particulate matter and another 1,200 from nitrogen dioxide linked to traffic.
France has suspended fights to and from Brazil because of concerns surrounding the P-1 Covid-19 variant prevalent in the country. Two flights will arrive in France this morning which took off before the midnight ban came into force.
Germany has reported more than 21,000 new infections in the past 24 hours and a rising seven-day incidence rate of 153.2.
A Dutch programme to hold test events with audiences is to continue later this week with 1,500 people attending a music award festival in Utrecht. Further big events will take place on 24 April with audiences of 8,000 and 10,000. Everyone needs a negative test before the event and then five days afterwards too.
In Croatia, Zagreb’s tourist board is offering half-price coronavirus tests to tourists who spend at least one night in the city. It wants them to extend their stay without worrying about their return home.
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