300 In Intensive Care After Swine Flu Cases Double in UK
Pregnant women are being urged to get vaccinated against flu viruses
It is unclear how many of the 302 patients have swine flu but they are thought to be in the majority.
Health Secretary Andrew Lansley said the NHS can cope with an upsurge after the number of critical cases almost doubled in a week.
The country's most senior doctor, Professor Dame Sally Davies, has urged people in at-risk groups – especially pregnant women - to come forward for the seasonal flu jab, which also protects against swine flu.
Prof Davies, the interim chief medical officer for England, said swine flu was the dominant strain in this year's flu cases.
"We have not got a pandemic," she added, saying a vaccine was available and some people are already immune.
Health Secretary Andrew Lansley says the NHS can cope with critical cases
Vaccination rates are slightly lower than last year.
In recent weeks, 14 people have died with confirmed swine flu and another three from flu type B. Last year, 474 people died from swine flu.
Prime Minister David Cameron told reporters at 10 Downing Street: "While obviously... the number of flu cases has doubled in the last week, there is still plenty of capacity in the NHS."
But shadow health secretary John Healey said Mr Lansley should "get a grip" of the flu outbreak and criticised him for axing national advertising urging people to get the flu jab.
As of Monday, there were 24 children under five in critical care with confirmed or suspected flu, another 12 aged five to 15, and 243 in the 16 to 64 age group.
There were also 23 people aged over 65 in critical care.
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