Those who have had the same sexual partner for the last three months will now be eligible to donate, NHS Blood and Transplant said.
British scientists and doctors urged the prime minister to err on the side of caution and postpone implementing the fourth stage of his government's four-step unlocking plan for England.
Britain and the EU are in a spat over post-Brexit trade arrangements that could see British sausages banned from entering Northern Ireland, the only part of the UK that borders the 27-nation bloc.
Gupta was once seen as the saviour of British steelmaking but is now fighting for survival following the collapse of its main lender Greensill Capital and fraud allegations.
When elected in 2019, he became the first prime minister to live at Downing Street as part of an unmarried couple.
Johnson, 56, and Symonds, 33, based at their Downing Street flat, were engaged in late 2019 and together have a one-year-old son, Wilfred.
The influential adviser was sacked at the end of last year, and has recently been involved in a war of words with Downing Street, which accused him of leaking internal conversations and documents.
The group said it intends to remain at the sites for at least 24 hours, causing "significant disruption" to the McDonald's supply chain.
The Cov-Boost study will trial seven vaccines to provide data on the impact of a third dose on patients' immune responses.
Johnson said the government is keeping everything under "very close observation" following the emergence of the B1.617.2 variant of concern.
Jenny McGee was one of two intensive-care nurses who gave Johnson round-the-clock treatment a year ago when he was struck down with Covid.
Bolton town has seen a sharp spike in infections since mid-April, Public Health England said.
Thanks to an efficient vaccine rollout programme, Britain is finally saying goodbye to months of tough lockdown restrictions.
The economy even managed to grow by a monthly rate of 2.1% in March when the country began easing some restrictions, notably by reopening schools.
Antony Blinken said any deal would take “some time” and that U.S. President Joe Biden wants to ensure any trade agreement would benefit American workers and their families.