Three new cases in Scotland on Thursday brought the total confirmed number of patients to 90.
There are six in Scotland, 80 in England, three in Scotland, one in Wales and three in Northern Ireland.
Professor Chris Whitty, the country's chief medical officer, said it was now "highly likely" that the virus is being spread across the UK by people who haven't travelled.
He said it was inevitable that the number of cases in the UK will rise, and it will almost certainly not be possible to prevent an outbreak.
UK Prime Minister Boris Johnson says school closures 'don't work as well as people think'
UK Prime Minister Boris Johnson has sought to play down the threat of the crisis.
"We need to strike a balance," Johnson told ITV's Good Morning programme on Thursday, adding that there was no need to consider school closures at this stage.
"Slightly counter-intuitively, closing schools and stopping big gatherings doesn't work as well as people think," he told the programme.
He added: "As far as possible it should be business as usual for the vast majority of people."
The British government has stopped trying to 'contain' the virus and is now trying to 'delay' it
The government has mostly stopped trying to "contain" the virus and is instead focusing on trying to delay its spread, the chief medical officer said on Thursday.
He said containing the spread of the virus among the early few patients who caught it was now "extraordinar[ily] unlikely" long-term outcome, and said the government was now focused on trying to delay the outbreak until the spring.
Whitty said that approach — which overlaps in many ways with "contain" — had several benefits. Those include delaying the peak until the NHS is in a better position to respond, and buying more time so that the disease can be better managed, possibly with the aid of new drugs.
Additionally, there may be a benefit to delaying the outbreak until the spring or summer, when the rate of infection may go down, as is the case with flu.
What measures are the government considering?
The government's action plan, which was published on Thursday, outlines a number of measures that might be introduced if there is a major outbreak. Ministers will make a decision as to which actions they introduce based on scientific advice, and
As well as potential school closures, these include:
Closure of mass gatherings, such as Royal Ascot and Glastonbury Festival, as well as football matches
The army being drafted in to support the emergency services
Asking employees across the country to work from home, possibly for around 12 weeks
Expanding its public information campaign, which encourages people to wash their hands regularly with warm water.