WATCH | Medical experts call for national inquiry into Canada's COVID response:Début du widget Widget. Fin du widget Widget. Tailored booster shots in the worksThe population-wide immune boost since the start of the pandemic comes as drug makers are tailoring the next round of booster shots to better match currently circulating variants. Booster shots will still play a role in keeping COVID at bay, say experts, especially for older adults. Older adults in particular should be prioritized for booster shots this fall, Skowronski stressed.