"If you are asked to take part in vital research for this country... If you get a letter, please respond as soon as you can," Health Secretary Matt Hancock said at Thursday's Downing Street press briefing.

Saying that testing capacity has increased to 51,000 a day, he noted that the government was on track to meet its target of carrying out 100,000 tests a day by the end of the month.

"From today, employers of essential workers will be able to go on gov.uk to get a test for any of their staff. From tomorrow, any essential workers who need a test will be able to book an appointment on gov.uk themselves, directly. This all applies for people in essential workers' households too who need a test. It's all part of getting Britain back on her feet," he told reporters.

Meanwhile, a team at the University of Oxford is starting a coronavirus vaccine trial on humans Thursday. The team started work on developing the vaccine to prevent COVID-19 on Jan. 20, 2020.

"This week we will start the process of vaccine evaluation in our first human studies and are currently focusing all efforts on preparing for the start of the trials," the team said Wednesday in a statement.

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