Research doesn’t back vaccine dose delay for seniors, Canada’s chief science adviser says


Canada’s top scientist is advising against extending the time between doses of the COVID-19 vaccines to four months in seniors, arguing the research isn’t there to justify the delay for that population and those with pre-existing conditions. In early March, Canada’s National Advisory Committee on Immunization (NACI) issued an updated guidance indicating that the interval between doses of the Pfizer-BioNTech, Moderna, and AstraZeneca vaccines could be extended to four months while still being effective. The changed guideline led several provinces, including Ontario, Manitoba and British Columbia, to alter the vaccine rollouts to include more age groups, but it means that second-dose appointments are being pushed back further than manufacturer recommendations. In Quebec, for example, not a single person has received a second dose of a COVID-19 vaccine.

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