Eleven more people in the UK have been confirmed with the swine flu virus - taking the total to 133.
The new cases are six adults and five children from the East Midlands, London, the South East and the West Midlands, the Health Protection Agency said.
Four of the cases were returning travellers and seven are linked to previously confirmed cases.
A spokesman for NHS London confirmed four of the new cases were in the capital.
Three are children connected to previously confirmed cases at Barnes School in Richmond, south west London, and the fourth is a woman from Redbridge in east London.
More than half of the British cases are in London, where 70 have been confirmed.
Swine flu has been described by the World Health Organisation this week as a "sneaky virus" which is likely to keep spreading.
WHO boss Dr Margaret Chan said: "It does not announce its presence or arrival in a new country with a sudden explosion of patients seeking medical care or requiring hospitalisation.
"We expect it to continue to spread to new countries and continue to spread within countries already affected."
So far, 86 people have died from the disease across the globe, the WHO confirmed on Saturday.
Last week, the UK Government ordered 90 million vaccines for the H1N1 virus from drug manufacturers GlaxoSmithKline and Baxter.
GSK has started making the vaccine but it is thought it could take up to six months for the UK to receive its first batch.
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