Coronavirus live: UK lockdown ‘long way’ from lifting, says Hancock; Israel still seeing cases after first Pfizer jab administered

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Health secretary says case rate too high to ease restrictions; first Pfizer dose does not immediately prevent infection, says Israeli health minister

New US coronavirus travel restrictions are likely to have an outsized impact on Mexico, which is also struggling with an uncontrolled outbreak of the virus and record-breaking deaths.

Among Joe Biden’s flurry of executive orders on Thursday was a new set of rules requiring all travellers entering the US by sea, air or land to show proof of a recent negative coronavirus test and self-quarantine or self-isolate after entry. The executive action also instructs federal officials to work with the governments of Mexico and Canada to draw up a coordinated plan for border crossings.

Related: Mexico faces challenge to light-touch Covid approach as US restricts travel

The chair of the Winton Centre for Risk and Evidence Communication at Cambridge, David Spiegelhalter, and Anthony Masters, a statistical ambassador for the Royal Statistical Society, explain the meaning of a Covid vaccine having “90% efficacy”.

Imagine 100 people are ill with Covid-19.“90% efficacy” means if only they’d had the vaccine, on average only 10 would have got ill. Vaccine efficacy is the relative reduction in the risk: whatever your risk was before, it is reduced by 90% if you get vaccinated. There is a lot of confusion about this number: it does not mean there is a 10% chance of getting Covid-19 if vaccinated – that chance will be massively lower than 10%.

Related: Behind the numbers: what does it mean if a Covid vaccine has ‘90% efficacy’? | David Spiegelhalter

Continue reading… Source: The Guardian

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