Winnipeg swimmer Kelsey Wog to compete in Tokyo on Wednesday

(Source: Canadian Olympic Committee) (Source: Canadian Olympic Committee)

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Why COVID-19 boosters weren't tweaked to better match variants

More COVID-19 booster shots may be on the way -- but when it's your turn, you'll get an extra dose of the original vaccine, not one updated to better match the extra-contagious delta variant. And that has some experts wondering if the booster campaign is a bit of a missed opportunity to target delta and its likely descendants.