Cabinet Office minister Michael Gove is isolating at home after a member of his family began to display symptoms of coronavirus.
The senior Tory is understood to be feeling well and will continue to work from home as normal, as ministers scramble to steady the ship after Boris Johnson was admitted to intensive care on Monday night.
Mr Gove tweeted: “Many thanks for kind messages. In accordance with the guidance, I am isolating at home after a member of my family started to display mild symptoms of coronavirus on Sunday.
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“I have not displayed any symptoms and am continuing to work as normal.”
It comes after the prime minister was transferred to the intensive care unit at St Thomas’ Hospital in London as a precaution following a deterioration in his condition.
Dominic Raab, the foreign secretary, will deputise for Mr Johnson wherever necessary in his role as first secretary of state – the de facto deputy prime minister.
Mr Gove, speaking before it emerged that he was in isolation, said Mr Johnson has received “oxygen support” but is not on a ventilator.
“He is kept, of course, under close supervision,” he told LBC radio.
“By being in intensive care, if there is further support he needs, it is there at hand. But the prime minister has not been on a ventilator.”
His comments were the first indication of the prime minister’s condition after it dramatically emerged on Monday night that he had been admitted to the ICU.
The worsening of his condition was greeted with shock in Westminster, and comes at a critical moment in the crisis, with experts predicting the epidemic could reach its peak in days.
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A man walks down a deserted Camden High Street
Photos Angela Christofilou
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Goodge Street Station is one of the many stations closed to help reduce the spread
Angela Christofilou
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An empty street in the heart of Chinatown
Angela Christofilou
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People in masks in Chinatown a day after the lockdown
Angela Christofilou
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A near-empty Piccadilly Circus during the first week of lockdown
Angela Christofilou
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Sonja, my neighbour, who I photographed while taking a short walk. It was nice to briefly chat even from a distance
Angela Christofilou
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A couple sit on the empty steps of the statue Eros in Piccadilly Circus
Angela Christofilou
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Making sure I stay two-meters apart – D’Arblay Street, Soho
Angela Christofilou
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A mannequin behind a shop window. UK stores have closed until further notice
Angela Christofilou
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A notice displayed on a shop window in Camden
Angela Christofilou
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As part of the lockdown, all non-essential shops have been ordered to close.Image from Camden High Street
Angela Christofilou
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A skateboarder wearing a mask utilises his exercise allowance in the Camden area
Angela Christofilou
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Communities have been coming together in a time of need
Angela Christofilou
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A woman stands alone in a deserted Oxford Street. Up until a few weeks ago, on average, half a million people visited the street per day
Angela Christofilou
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A couple walk hand in hand down a street in Soho, a day before the stricter lockdown was announced
Angela Christofilou
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During the first week of March, shoppers focused on stockpiling necessities ahead of a countrywide lockdown
Angela Christofilou
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Many supermarkers are operating a queuing system to make sure only a limited amount of customers are allowed in at anyone time
Angela Christofilou
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‘Stay Safe’ – Curzon cinemas are temporarily closed under the new measures
Angela Christofilou
19/29
Pubs, restaurants and bars were ordered to shut as part of the lockdown
Angela Christofilou
20/29 Camden High Street
There are fears that coronavirus could lead to permanent closure of struggling shops
Angela Christofilou
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Camden Town is eerily silent on a normal working day
Angela Christofilou
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Shops and supermarkets ran out of hand sanitisers in the first week of the lockdown. As we approach the end of the second week most shops now have started to stock up
Angela Christofilou
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Empty streets around Soho
Angela Christofilou
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A noticeboard on Camden High Street urges the public to stay at home
Angela Christofilou
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Camden High Street, one of London’s busiest tourist streets turns quiet
Angela Christofilou
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Thriller Live confirmed its West End run ended in the wake of the coronavirus outbreak
Angela Christofilou
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Empty and eerie Soho streets after stricter rules on social distancing announced
Angela Christofilou
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A woman pauses for a cigarette on Hanway Street, behind Tottenham Court Road
Angela Christofilou
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A man steps outside onto Hanway Street, that sits behind what is usually a bustling retail hub
Angela Christofilou
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A man walks down a deserted Camden High Street
Photos Angela Christofilou
2/29
Goodge Street Station is one of the many stations closed to help reduce the spread
Angela Christofilou
3/29
An empty street in the heart of Chinatown
Angela Christofilou
4/29
People in masks in Chinatown a day after the lockdown
Angela Christofilou
5/29
A near-empty Piccadilly Circus during the first week of lockdown
Angela Christofilou
6/29
Sonja, my neighbour, who I photographed while taking a short walk. It was nice to briefly chat even from a distance
Angela Christofilou
7/29
A couple sit on the empty steps of the statue Eros in Piccadilly Circus
Angela Christofilou
8/29
Making sure I stay two-meters apart – D’Arblay Street, Soho
Angela Christofilou
9/29
A mannequin behind a shop window. UK stores have closed until further notice
Angela Christofilou
10/29
A notice displayed on a shop window in Camden
Angela Christofilou
11/29
As part of the lockdown, all non-essential shops have been ordered to close.Image from Camden High Street
Angela Christofilou
12/29
A skateboarder wearing a mask utilises his exercise allowance in the Camden area
Angela Christofilou
13/29
Communities have been coming together in a time of need
Angela Christofilou
14/29
A woman stands alone in a deserted Oxford Street. Up until a few weeks ago, on average, half a million people visited the street per day
Angela Christofilou
15/29
A couple walk hand in hand down a street in Soho, a day before the stricter lockdown was announced
Angela Christofilou
16/29
During the first week of March, shoppers focused on stockpiling necessities ahead of a countrywide lockdown
Angela Christofilou
17/29
Many supermarkers are operating a queuing system to make sure only a limited amount of customers are allowed in at anyone time
Angela Christofilou
18/29
‘Stay Safe’ – Curzon cinemas are temporarily closed under the new measures
Angela Christofilou
19/29
Pubs, restaurants and bars were ordered to shut as part of the lockdown
Angela Christofilou
20/29 Camden High Street
There are fears that coronavirus could lead to permanent closure of struggling shops
Angela Christofilou
21/29
Camden Town is eerily silent on a normal working day
Angela Christofilou
22/29
Shops and supermarkets ran out of hand sanitisers in the first week of the lockdown. As we approach the end of the second week most shops now have started to stock up
Angela Christofilou
23/29
Empty streets around Soho
Angela Christofilou
24/29
A noticeboard on Camden High Street urges the public to stay at home
Angela Christofilou
25/29
Camden High Street, one of London’s busiest tourist streets turns quiet
Angela Christofilou
26/29
Thriller Live confirmed its West End run ended in the wake of the coronavirus outbreak
Angela Christofilou
27/29
Empty and eerie Soho streets after stricter rules on social distancing announced
Angela Christofilou
28/29
A woman pauses for a cigarette on Hanway Street, behind Tottenham Court Road
Angela Christofilou
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A man steps outside onto Hanway Street, that sits behind what is usually a bustling retail hub
Angela Christofilou
Downing Street said Mr Johnson’s transfer to hospital on Sunday was a “precautionary step” following the persistence of his cough and high temperature – despite 10 days in self-isolation.
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He initially sought to continue to work from his hospital bed but he was later moved to intensive care in case he needed a ventilator.
Mr Johnson’s fiancee Carrie Symonds, who is pregnant with their first child, is unable to visit him in hospital.
She has said she is “on the mend” after being forced to self-isolate for displaying coronavirus symptoms.
