//Coronavirus live news: US questions Beijing cluster figures as WHO eyes 2bn Covid-19 vaccine doses by end of 2021

Coronavirus live news: US questions Beijing cluster figures as WHO eyes 2bn Covid-19 vaccine doses by end of 2021

Researchers working on more than 200 vaccines, says WHO; global deaths pass 450,000; Brazil nears 1m cases. Follow the latest updates

US questions new China outbreak figuresBeijing outbreak may have started a month earlier than thoughtWHO eyes 2bn vaccine doses by end of 2021Coronavirus map of the US: latest cases state by stateSee all our coronavirus coverage

12.58am BST

The number of coronavirus cases in California’s San Quentin state prison has tripled within the last two weeks, prompting advocates, families and attorneys to demand urgent action to fast track the release of prisoners and curb the spread among correctional officers.

San Quentin, California’s oldest prison and home to the state’s only death row for male prisoners, reported its first batch of 15 positive cases on 3 June. Since then, that number has risen to 46.

Related: San Quentin: outcry after Covid-19 cases at California prison triple in two weeks

12.48am BST

The World Health Organization said Thursday that a few hundred million Covid-19 vaccine doses could be produced by the end of the year – and be targeted at those most vulnerable to the virus.

The UN health agency said it was working on that assumption, with a view to two billion doses by the end of 2021, as pharmaceutical firms rush to find a vaccine.

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Read more: theguardian.com