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Britons going on their summer holidays have been warned not to travel if they have swine flu.
The Department of Health, which is currently setting up a new pandemic flu service, advised people with the virus to delay journeys until symptoms had gone.
Officials warned that visitors to a number of countries would have to face strict screening procedures as the illness spreads.
This was demonstrated in China, where 52 British schoolchildren and teachers were placed in quarantine in a Beijing hotel after four teenagers from London were diagnosed with swine flu.
According to the DoH, holidaymakers should take medication such as paracetamol with them and avoid public places if they fall ill.
People travelling to Europe should carry a European Health Insurance Card (EHIC).
If they catch swine flu - symptoms of which are a high temperature as well as two or more of a list including headache, sore throat, runny nose and aching muscles - they should not travel home until recovered
Health Secretary Andy Burnham, who is due to give a statement to the Commons on Monday, said: "I want families to go on their holidays and have a great time this summer.
"And mums and dads shouldn't worry unnecessarily about swine flu.
"But, just as they would anyway, parents should keep a close eye on their children's health.
"If you're going abroad, as ever, make sure you know where you can get medical advice and if you're holidaying in the UK, remember that from the end of this week alongside GP services, you'll also able to phone the national pandemic flu service hotline for advice."
The advice came as a senior adviser to the Government moved to calm concerns over the swine flu vaccine after questions were raised about whether it will have been sufficiently tested before it is used.
The first deliveries of the vaccine are expected to arrive next month, sparking concerns that doses will be administered before full clinical trials are completed.
But Professor Sir Gordon Duff, co-chairman of the Scientific Advisory Group for Emergencies, said the "benefits far outweigh the risks".
He added: "These core vaccines have been tested on 5,000-6,000 people already, with no serious adverse effects."
Thousands of people in Britain have been affected by swine flu and the total number of UK deaths linked to the virus stands at 29.
Three of the year nine (aged 13-14) children taken ill in China were from the Central Foundation Boys School in Clerkenwell, while one attended Parliament Hill School in Camden.
The quarantined group was among a party of around 600 British students and teachers from across the UK who had travelled to China.