R measures the number of people, on average, that each sick person will infect.

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We asked the UK's current vaccine providers when we can expect our boosters.
From Somerset House to the Palace of Versailles, this master baker's made them all.
Scientists are recommending this (slightly gross) method for reducing transmissions.
The Pinky Gloves trio have now apologised for their 'big mistake'.

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The test may be available by autumn, allowing doctors to closely monitor those at the highest risk.
Family of railway worker who died of Covid have complained to the police conduct watchdog.
Government spokesperson says health secretary has "acted entirely properly" in declaring interest in Topwood Limited.
PM is due to meet Narendra Modi as part of shortened trip as the UK aims to strike a post-Brexit trade deal.

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Sales of "super-prime" homes in the capital increased in 2020 despite the pandemic.
Exclusive: Opposition says delayed register of interests must now be published amid Greensill scandal.
Graphic footage shows the boy had his hands up when an officer killed him on March 29.
A group of respiratory experts say we should focus on tackling airborne transmission. Here's why.
Minneapolis is on edge as a verdict in the high-profile trial regarding George Floyd's death inches closer.
The government has not updated official data, refused to answer questions, and failed to hold a single press conference.
Commons leader tells MPs "you would expect" people not to take photos of "private" acts taking place in public.
Housing support services are failing young queer people, according to a damning report.
Hancock said the government had “a duty of care to those most vulnerable to Covid”. Unions warn plan could "backfire".
Commons leader praises under-fire former Conservative prime minister.

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