Health officials have called off the regular COVID-19 briefing in British Columbia as they prepare to update the province's strategy for immunization against the virus.

An advisory from the premier's office says the briefing by provincial health officer Dr. Bonnie Henry and Health Minister Adrian Dix is cancelled.

Instead they will join a news conference Friday with Premier John Horgan and Dr. Penny Ballem, who is leading B.C.'s COVID-19 immunization rollout.

The four are expected to comment on the next steps in the immunization program that has been complicated by a hiccup in vaccine supply from Pfizer-BioNTech.

Nearly 31,000 doses of vaccine the province expected by Jan. 29 could be curtailed due to production issues.

Two doses of the vaccine are needed to ensure immunity from the virus that causes COVID-19 and Dix said Tuesday that B.C. was set to begin delivery of second doses and remains committed to ensuring all those who have had the first shot get a second within 35 days.

In a joint statement Wednesday, Dix and Henry confirmed 98,125 doses of the COVID-19 vaccine have already been administered.