Archived 16: Summary of National Advisory Committee on Immunization (NACI) updates of July 22, 2021

Recommendation for people previously infected with SARS-CoV-2 virus

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This is an archived version. Please refer to current COVID-19 vaccine pages:

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NACI continues to recommend:

To see the full update, please visit NACI Recommendations on the use of COVID-19 vaccines.

What you need to know


"We continue to learn more about infection from SARS-CoV-2 virus and its variants, and how our bodies are responding to COVID-19 vaccines. The latest evidence and our understanding of immunology tells us that individuals who have been previously infected have adequate protection for several months after the infection, which is improved after the first dose of COVID-19 vaccine. We are not clear how this protection will translate against new variants of the virus. There are many reasons that jurisdictions may offer, and individuals may choose, a complete series of two vaccines even after a previous infection, including participation in activities or travel."

Dr. Shelley Deeks, NACI Chair

"I would like to thank the experts on NACI for their careful and thoughtful review. As we continue to study and learn about SARS-CoV-2 and the human response to this virus, recommendations will be tailored and updated. At this point, those who have been previously infected do have an immune response that is enhanced by one or two doses of the vaccine. Provinces and territories will consider NACI advice in the design of their programs. Vaccines, in combination with public health measures and individual precautions, continue to be key in reducing the spread of COVID-19."

Dr. Theresa Tam, Chief Public Health Officer

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