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Health minister and Conservative MP Nadine Dorries has been diagnosed with coronavirus.
Ms Dorries said she has been self-isolating at home, – Labour MP Rachael Maskell said she has since been told to do the same as she had met Ms Dorries.
The Department of Health said Ms Dorries first showed symptoms on Thursday – the same day she attended an event hosted by the prime minister.
Six people with the virus have died in the UK, which has a total of 382 cases.
The latest person to die was a man in his early 80s who had underlying health conditions.
Meanwhile, a 53-year-old British woman has become the first person with Covid-19, the disease caused by the virus, to die in Indonesia, according to local media reports.
It is not clear whether the woman – who was reportedly critically ill with multiple health conditions – died due to the virus.
The Foreign and Commonwealth Office said it is “supporting the family of a British woman who has died in Indonesia and are in contact with local authorities”.
In other developments:
- The Bank of England has announced an emergency cut in interest rates from 0.75% to 0.25% in response to the economic impact of the coronavirus outbreak
- NHS England is scaling up its capacity for testing people for the infection. Public Health England, which has already carried out more than 25,000 coronavirus tests across the UK, is set to expand the number of people it can test a day to 10,000 – currently 1,500 are being carried out.
- Confirmation of any positive test results will also be accelerated with most people getting a result back within 24 hours.
- Manchester City’s Premier League match against Arsenal on Wednesday has been postponed as several Arsenal players are in self-isolation after coming into contact with Olympiakos owner Evangelos Marinakis, who tested positive for the virus.
The government will unveil its first Budget later, amid growing fears about the impact the outbreak will have on the UK economy.
Chancellor Rishi Sunak has pledged the NHS will get “whatever resources it needs” during the crisis, while he is also expected to unveil measures to boost the self-employed and small businesses who are left out of pocket.
Ms Dorries, the MP for Mid Bedfordshire, said that Public Health England had started tracing people she had been in contact with, and the department and her parliamentary office were closely following its advice.
The 62-year-old, who began her career as a nurse, later tweeted that it had been “pretty rubbish but I hope I’m over the worst of it now”.
But she added she was worried about her 84-year-old mother who was staying with her and began to cough on Tuesday.
It is not known how many meetings Ms Dorries had attended at Westminster or in her constituency in recent days.
It is understood that she attended an event at Downing Street last week to mark International Women’s Day.
No 10 did not comment on whether Boris Johnson had undergone testing, or whether he will now be tested.
Public Health England will advise those who have had recent contact with Ms Dorries, including ministers and officials, as to whether they need to self-isolate and report any symptoms.
Labour MP Rachael Maskell has tweeted she has been told to self-isolate “as a result of a meeting” she had with Ms Dorries last Thursday.
Health Secretary Matt Hancock tweeted that Ms Dorries had “done the right thing” by self-isolating at home and wished “her well as she recovers”.
NHS chief scientific officer Prof Dame Sue Hill said the health service was preparing to cope with more cases.
“Every hospital across the country, and the healthcare professionals who run them, are now actively planning to respond flexibly to manage new demand.”
Scotland, Wales and Northern Ireland will be expected to roll out their own testing services, but there will be some shared capacity between nations, depending on need.
The number of total cases for the UK include 324 cases in England, 27 in Scotland, 16 in Northern Ireland and 15 in Wales.
There are 91 in London, with the next highest infected area being the south-east, with 51 cases. Cases by local council area in England can be viewed here.
The latest person to die, on Monday, was a man in his 80s, with underlying health conditions, who was being treated at Watford General Hospital.
He caught the virus in the UK and officials are trying to trace who he had been in contact with.