When will we see the effects of Covid vaccines? Boris Johnson says mid-February

Britain won’t know much effect the coronavirus vaccines are having on the country’s epidemic until mid-February, Boris Johnson and his chief scientists said tonight.

The PM said the impact of the jabs won’t be felt in hospital and deaths data until then due to the lag in time it takes between getting injected and developing immunity.

He told a Downing Street press conference tonight that he would not consider lifting lockdown restrictions until he’d seen concrete ‘evidence that those graphs are coming down’. 

The immunisation drive has only really got up to speed in the last few weeks and it takes between a fortnight and a month for a person to build up immunity.

Both the Pfizer and Oxford University vaccines have been proven to block severe illness, so experts hope they’ll start to make a dent in the death and hospitalisation rates in the coming weeks.   

No10’s scientists will be monitoring those metrics, specifically in the most vulnerable groups – including the over-80s, over-75s and care homes residents – who are currently receiving the jabs.

So far 6.8million, or one in 10, people in Britain have received at least one dose of the vaccines. In three weeks time, when most of those people have protection, experts will expect to see a near 10 per cent drop in hospital admissions.

Not all of the people vaccinated will be immune, however, because the jabs are not perfect. Pfizer’s is 95 per cent effective at blocking severe disease, while Oxford’s is around 70 per cent. 

Another burning question which will determine how gung-ho ministers can be with easing restriction is to what extent the vaccines stop people from spreading Covid.

The Government has commissioned a study to investigate the vaccines and their role on transmission, which is being overseen by Public Health England. It is focused on frontline healthcare workers who’ve been jabbed.

Britain won’t know much effect the coronavirus vaccines are having on the country’s epidemic until mid-February,…

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