Maybee, I found this, dated 1st November, on the British Heart Foundation site:
How long does the booster take to work?
A recent study showed that from seven days onwards, a booster dose of Pfizer is extremely effective at preventing illness from Covid-19.
No large-scale trials have looked at how long a booster dose of Moderna takes to be most effective, but we do know that the vaccines work in similar ways.
You shall see your granddaughter, all being well!
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