First dose Dec 20 & second dose Jan 31st.
At the time we weren't sure what optimal dosing interval was & had ongoing supply issues, so many got 2 doses at varying shorter intervals.
Now we know ~12 weeks is a good interval, but also are seeing waning immunity.
3/ Waning Immunity
Data is showing our antibody levels to #COVID19 are decreasing, but that doesn't mean our overall immunity is, as we are seeing by our vaccine effectiveness data in BC.
But, in BC we still are losing too many ppl, almost 50 have passed in last week.
4/ What data do we have on boosters?
More to come for sure, but Pfizer released data last week, RCT of 10,000 ppl that showed post booster
"relative vaccine efficacy of 95.6% against disease during a period when Delta was the prevalent strain"
Don't know yet, but based on vaccine science we can expect that a booster like this may induce longer term immunity as we have seen in Hepatitis B, Diphtheria, Tetanus, Pertussis, Polio, & Haemophilus influenzae type b Vaccines etc.
6/ How can we in good conscience get our booster when many in the world haven't gotten first?
We know the world is suffering, but as HCW we have a responsibility to make sure we're keeping our patients safe, so as our authorities recommend it, we will get it to do our part.
7/ Canada - COVAX contribution
Canada made more commitments at G20 today.
"In all, between financial contributions and direct delivery of doses, Canada says it will help deliver at least 200 million shots of vaccine by the end of next year."
"Introducing booster doses should be firmly evidence-driven and targeted to the population groups in greatest need. The rationale for implementing booster doses should be guided by evidence on waning vaccine effectiveness..."
"As the booster campaign ramped up, new Delta infections, hospitalisations and deaths began to dramatically tumble. More than a third of the Israeli population has now been triple-vaccinated."