Five Britons have tested positive for coronavirus in eastern France, the French health minister confirmed.
Four adults and a child were diagnosed with the virus after coming into contact with a British national who recently returned from Singapore.
That man returned to the UK on 28 January before being diagnosed with the virus himself on Thursday.
The five Britons, who stayed in the same ski chalet, were not in a serious condition, French officials said.
French authorities are closing two schools next week attended by the child with the virus, a nine-year-old boy who lives in the ski resort of Contamines-Montjoie with his family.
There have been almost 35,000 cases of the coronavirus globally, mostly in China. The latest incident stems from a man who became
the UK's third confirmed case when he tested positive on his return to Brighton.
The Briton had stayed in Singapore on a business trip from 20 to 23 January, the French health ministry said.
He arrived at Contamines-Montjoie, in Haute-Savoie, on 24 January for a four-day trip, before returning to England on 28 January.
On his return to the UK, he is thought to have isolated himself at home and called NHS 111. After a positive test, he was taken to St Thomas' Hospital in London where he is being treated.
Public Health England also advised a student at Portslade Aldridge Community Academy in Brighton to self-isolate for 14 days, as part of their investigation into this case of coronavirus. The school said it had been advised by health authorities that there was no need to close.
The Brighton man told UK authorities that he had visited a chalet in Contamines-Montjoie, prompting French officials to take the 11 Britons staying there to hospitals in Lyon, Saint-Etienne and Grenoble on Friday night.
The chalet has two apartments where two families were staying, French authorities said in a news conference. A British couple and their three children, who are now resident in France, lived in one. The mother is in the UK at the moment and has been contacted.
Seven of their friends were staying in the other apartment.
Those with the virus are the father of the family resident in France and his nine-year-old son, as well as three members of the visiting family.
The nine-year-old boy attends the local school and has French classes at another school in St-Gervais. Both schools will be shut next week, and parents are being asked to keep their children under observation.
A crisis unit has been set up as a result of the new cases.
It comes as four members of the same British family were admitted to hospital in Majorca after contact with a coronavirus carrier.
They are being tested at the University Hospital of Son Espases in Palma.
The British family said they had
been in contact with a person who recently tested positive for the virus in France, the government in Spain's Balearic Islands said.
Meanwhile, a British man transferred from a cruise ship off the coast of Japan on Friday after testing positive for the virus is said to be feeling well and in good spirits.
Alan Steele, from Wolverhampton, on his honeymoon with his wife Wendy, was among
61 people to be taken off the ship for hospital treatment.
She has been in telephone contact with her husband, and said in a Facebook post on Saturday that he was still feeling healthy.
