Nearly 15,000 people who attended a dental conference in Vancouver in early March have been told to self-isolate immediately by B.C.'s provincial health officer who said multiple cases of coronavirus have been traced to the event.

On Monday, Dr. Bonnie Henry said 30 additional cases of COVID-19 have been confirmed in B.C. since Saturday, bringing the total in the province to 103.

Henry said at least four of those new cases are related to an infected person who attended the Pacific Dental Conference, held at the Vancouver Convention Centre March 5 to 7.

Henry said cases of COVID-19 identified in other areas of the country have also been traced back to the Vancouver conference.

According to Vancouver Coastal Health, the initial person who has tested positive for COVID-19 attended the conference on March 6 between 2 p.m. and 4 p.m.

Henry says anyone who attended the event must self-isolate for 14 days.

"They should not be at work. They should not be at school. They should not be around others," said Henry.

If symptoms develop, people are asked to contact 811 or their health care provider. Only if symptoms are severe, such as shortness of breath or chest pain, should British Columbians call 911 or go to the Emergency Department.