The whole of Italy has been added to the list of countries from which people returning should self-isolate if they develop symptoms.
It means people returning to Jersey after visiting anywhere in the country should self-isolate if they develop a cough, fever or difficulty breathing.
The new advice - issued today by Jersey's government - is in addition to previous guidance that those coming back from 11 specific towns in northern Italy should quarantine themselves even if they don't feel unwell.
The island's Emergencies Council is due to meet next week to review how the island's schools and business will operate coronavirus if the virus reaches here.
The Chief Minister will chair the meeting next Thursday - to discuss how Jersey will manage cases of the illness.
If you think you might have the virus, you should self-isolate and call the Health Department's coronavirus helpline:
It's open every day between 8am and 8pm. Calls outside these times, or when the line is engaged, won't be answered straight away - but we're told to leave a message and Health officials will call you back.
Please don't visit your GP or the Emergency Department at the General Hospital if you think you have the virus.
Coronavirus symptoms are similar to that of the flu - a combination of a cough, fever and aching muscles. If you've had any symptoms, even if you haven't travelled abroad, we're being told to self-isolate until they clear up (for a minimum of seven days).
Anyone who has come into contact with a person confirmed to have the coronavirus should stay in self-isolation for at least 14 days.
All the latest information can be found on Gov.je.