On Thursday, May 13, Dr. Bonnie Henry provided a B.C. COVID-19 update. During her announcement, the health official noted that people have been inquiring about the effectiveness of having a single dose of a COVID-19 vaccine.
In response, she presented data on "Breakthrough COVID-19 Case Counts." She described a breakthrough case as "somebody who's received at least one vaccine."
COVID-19 BC Update www.youtube.com
Henry said that 98.2% of the province's cases between December 27 and May 1, 2021, have been "unvaccinated people or people who have not yet mounted that full immune response." This means someone who has received no vaccine doses or someone who is within 21 days after receiving their first dose.
Further, 1.7% of B.C.'s cases in that same timeframe were people who have had a single dose and passed the 21-day mark.
Finally, only 0.2% of cases were vaccinated people with two doses at seven or more days since their last dose.