Hundreds of people at a popular ski resort who came into contact with a British family infected with the coronavirus have been tested for the illness.
Environmental consultant Bob Saynor, 48, and his nine-year-old son are being treated for the deadly virus at a hospital in France, along with three other Brits from another family who were staying in their six-bedroom ski chalet.
Emergency services have descended on the town of Les Contamines-Montjoie, near Megeve, amid fears that hundreds could have been infected with the virus.
Officials are trying to establish who may have come into contact with the five infected Brits.
Hundreds have been tested for cononavirus in the town of Les Contamines-Montjoie, near Megeve in the French Alps
Environmental consultant Bob Saynor, 48, and his nine-year-old son have been named locally as being at the centre of the outbreak and are being treated in hospital
The results were due to be known by authorities on Sunday evening.
Worried families, wearing facemasks, gathered at a medical centre adjoining the school attended by the child in Les Contamines.
Officials have closed the 95-pupil primary school for lessons this week in the small ski resort, an hour from Geneva.
The nine-year-old son of British couple Bob and Catriona Saynor, who moved to the Alps three years ago, is in hospital in France after being airlifted from the resort on Friday afternoon.
The local ambulance service estimated 200 people had been tested by Sunday afternoon.
Health Minister Agnès Buzyn, speaking at a hastily arranged press conference in Les Contamines, said: 'We have prioritised the children who have been in the most contact with the affected child, then the children who have symptoms and finally those who are less at risk because their contact has been reduced.
'The situation is changing, our decision will depend on whether we have positive results in the evening.'
The local ambulance service estimated 200 people had been tested by Sunday afternoon
Officials have closed the 95-pupil primary school for lessons this week in the small ski resort, an hour from Geneva
Environmental consultant Mr Saynor, 48, has also been diagnosed with the deadly virus along with three other Brits from another family who were staying in the Saynor's six-bedroom ski chalet.
Mr Saynor's two other children and four other Britons from the other family are in isolation in French hospitals as a precaution.
A second school in nearby Saint-Gervais, which has 200 pupils and was attended by the Saynor's son for one day last week, will also be shut this week.
The mayor, Jean-Marc Peillex, advised against panic.
He said: 'We must not panic an entire population. We want to put into perspective the risk of contamination - the young Briton did not rub shoulders with a whole school but he rubbed shoulders with five students for half a day.'
The Les Contamines Ski Club, where the child