Speaking in Parliament as MPs debated the extension of the lockdown by four weeks, Mr Hancock said: "Unfortunately there has been a significant change since we started on our journey down the road map in February".
Among patients in the study who had no measurable antibodies after receiving two doses of vaccine, one-third of them saw a rise in antibodies after a third dose - and among those with low antibody levels after two doses, all of them saw an increase after a third dose.
Lahore's Expo Center was also facing the shortage of coronavirus vaccines Sinopharm, Sinovac and AstraZeneca.
"With active participation and smooth vaccination, we expect to reach the first-dose vaccination for 36 million people by September", health ministry official Yoon Tae-ho told a briefing.
"And we have the capacity to maintain this acceleration of our vaccine rollout provided our supplies are steady and continue to arrive", Singapore Health Minister Ong Ye Kung said at a press briefing last week. The rest have not yet had a dose of the vaccine.
G7 summit kicks off with virus, global economy and climate driving agenda
Dr Tedros stressed that "the world needs a stronger global surveillance system to detect new epidemic and pandemic risks". President Biden had a pull-aside meeting with French President Emmanuel Macron on Friday during the G7 summit .
A health worker takes a nasal swab sample at a COVID-19 testing site at St. John's Well Child and Family Center on July 24, 2020, in Los Angeles. This is a great achievement reflecting public trust in the Covid-19 vaccines and the whole process.
See more stories on Insider's business page. "The response has improved also because the government has removed the age bar", said Dr Qureshi.
A 68-year-old man, fully vaccinated, died on March 31 and it has been labelled as "vaccine product related reaction" in a report assessing 31 severe cases reported since the government launched the vaccine drive in January. They are required to fill out a consent form to get an AstraZeneca shot.
He said at least 70% of the world's population needed to be vaccinated against Covid-19 to end the pandemic.