A school in Harlow has been closed because of fears about the coronavirus.
Staff at William Martin took the decision after a teacher came back from Northern Italy where there have been a number of confirmed cases.
A school in Sidcup also sent some pupils home after they returned from a ski trip in the same area and began feeling unwell.
Teachers at both schools said the moves were a precaution and no cases have been confirmed.
London's Mayor said he is not alarmed and the capital is well prepared for the potential of the virus spreading.
In Canary Wharf, energy firm Chevon asked about 300 British employees to work temporarily from home after an employee in its Canary Wharf office reported a flu-like illness.