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A shopper wearing a face covering crosses the street at Oxford Circus in London.

Relatives embrace as they arrive from the US at Heathrow's Terminal 5 in west London.

A mother embraces her son as he arrives from the US at Heathrow. People fully vaccinated in the US and EU, except France, can now travel to England without having to quarantine on arrival.

Families reunite as they arrive from the US at Heathrow.

Relatives embrace as they arrive from the United States at Heathrow's Terminal 5.

Mothers Debbie Greaves, center, and Karen Tyler, right, who don't know each other, wait to greet their sons arriving on different flights at Terminal 5 of Heathrow Airport.

Circus lighting technician Ryan Dobie receives a vaccination as circus performers look on at a new ‘Pop Up’ vaccination centre in the Big Top of Circus Extreme in Shibden Park in Halifax.

Dr Lisa Pickles, clinical lead for the local vaccination program, prepares a syringe at the Big Top of Circus Extreme vaccination clinic.

Travellers exit from an arrivals gate at St Pancras International station following the arrival of a Eurostar train from Paris, in London.

An NHS worker prepares for patients at a pop-up vaccination centre during a four-day Covid-19 vaccine festival in Langdon Park, east London.

A person receives a dose of the Pfizer/BioNTech vaccine at the Central Middlesex Hospital in London.

A health worker wears a mask which bears a slogan asking for fair pay for nurses during a demonstration about pay in the UK's National Health Service, in London.

Gardener Gemma Hearn making a final trim of the Hampton Court Maze before it reopens to the public at Hampton Court Palace, in south-west London.

Customers queue for the London Eye attraction on the South Bank of the River Thames in central London.

An NHS public health message in view of Westminster Abbey in London.

A shopper wearing a face covering crosses the street at Oxford Circus in London.

Relatives embrace as they arrive from the US at Heathrow's Terminal 5 in west London.

A mother embraces her son as he arrives from the US at Heathrow. People fully vaccinated in the US and EU, except France, can now travel to England without having to quarantine on arrival.

Families reunite as they arrive from the US at Heathrow.

Relatives embrace as they arrive from the United States at Heathrow's Terminal 5.

Mothers Debbie Greaves, center, and Karen Tyler, right, who don't know each other, wait to greet their sons arriving on different flights at Terminal 5 of Heathrow Airport.

Circus lighting technician Ryan Dobie receives a vaccination as circus performers look on at a new ‘Pop Up’ vaccination centre in the Big Top of Circus Extreme in Shibden Park in Halifax.

Dr Lisa Pickles, clinical lead for the local vaccination program, prepares a syringe at the Big Top of Circus Extreme vaccination clinic.

Travellers exit from an arrivals gate at St Pancras International station following the arrival of a Eurostar train from Paris, in London.

An NHS worker prepares for patients at a pop-up vaccination centre during a four-day Covid-19 vaccine festival in Langdon Park, east London.

A person receives a dose of the Pfizer/BioNTech vaccine at the Central Middlesex Hospital in London.

A health worker wears a mask which bears a slogan asking for fair pay for nurses during a demonstration about pay in the UK's National Health Service, in London.

Gardener Gemma Hearn making a final trim of the Hampton Court Maze before it reopens to the public at Hampton Court Palace, in south-west London.

Customers queue for the London Eye attraction on the South Bank of the River Thames in central London.

An NHS public health message in view of Westminster Abbey in London.

A shopper wearing a face covering crosses the street at Oxford Circus in London.

Covid-19 vaccine efficacy against Delta variant declines after three months

British researchers find Pfizer-BioNTech and AstraZeneca lost effectiveness even after two shots

Daniel Bardsley

August 19, 2021

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