UK health officials are moving towards the second phase of their response to the coronavirus outbreak.
In the "delay" phase measures will be ramped up to slow the spread of the virus, the country's chief medical adviser Prof Chris Whitty said.
He told MPs it was "highly likely" some people now being infected in the UK have no connection to overseas cases.
Three new cases of the virus in Scotland have brought the total number of positive tests in the UK to 90.
Speaking to MPs on the health and social care committee, Prof Whitty said the country was now "mainly" in the delay phase of the government's four-part plan to tackle the virus, but was still following aspects of the first phase.
Downing Street said it would formally announce when it switches from the contain to delay stage of taking on the virus – and that this has not yet happened.
It is still being decided what measures will be taken in the delay phase – but the government has said they could include banning big events, closing schools, encouraging people to work from home and dissuading the use of public transport.
Prof Whitty said there was "no need" for members of the public to stockpile food or medicine.
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The government has said it has a stockpile of important medicines and protective equipment, to counter any impact to global supply chains.
"This is going to be… a marathon not a sprint," Prof Whitty said.
"There is nothing in the current environment that would rationally lead someone to want to go out and stock up on stuff," Prof Whitty added.
Prof Whitty said consequences of the delay phase included:
- Pushing the peak of cases "further away from the winter pressures on the NHS" so that there was "more capacity to respond"
- Buying time to allow the UK to improve its response or develop counter measures such as drugs, vaccines and diagnostics
- There may be a seasonal element of the virus – so if the peak was delayed to spring or summer, the "natural rate" of transmission could be lower
Prof Whitty said the early stages of the delay phase were similar to the contain phase, and involved identifying cases of the virus, isolating patients, and tracing anyone who had been in contact with them.
"As time moves by, we then may start to move into the more socially determined actions… the kind of measures we can do to delay things which involve changes to society," he said.
He said it was likely that later in the response, elderly people and those with pre-existing health conditions would be advised to "have some degree of isolation from more public environments" and may be told, for example, to "avoid crowded areas".
On Wednesday the highest day-on-day rise in cases in the UK was reported, when the number of cases jumped from 51 to 87.
The UK's early response to the virus, which causes Covid-19, was based on the spread being controlled in China, with some minor outbreaks in other countries, Prof Whitty said.
But he added: "The chances of that happening are now very slim. Slim to zero."
Prof Whitty said in the worst case scenario of an epidemic in the UK, critical care beds would be "under pressure at quite an early stage".
In other recent developments:
- UK airline Flybe has gone into administration and says coronavirus is partly to blame
- England's Six Nations games against Italy in Rome on 14 and 15 March are expected to be postponed – rather than taking place behind closed doors – as a response to the outbreak
- Iran will close schools and universities until 20 March in an attempt to curb the spread
- Switzerland has reported its first death from the virus – a 74-year-old woman who died in hospital in Lausanne
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