The National Advisory Committee on Immunization (NACI) has recommended a temporary suspension of the use of the AstraZeneca/SII Covishield vaccines in Canadians under 55. This is a precautionary measure, as the vaccine may be associated with rare cases of blood clots, totaling less than 30 cases worldwide out of 20 million people who received the vaccine.
Immunization has saved more lives in Canada in the last 50 years than any other health measure. Canada has a very thorough system to approve new vaccines for human use. Only vaccines that have been shown to be safe are approved. Once approved for use, all vaccines are closely monitored by public health officials and Health Canada for their safety. The COVID-19 vaccines currently used in Canada have been administered to millions of people around the world and have been shown to be both safe and effective.