NASCAR shifts season-opening exhibition to L.A. Coliseum

Denny Hamlin (11) and Martin Truex Jr., (19) lead the field at the start of the NASCAR Cup series auto race in Richmond, Va., on Sept. 11, 2021. (Steve Helber / AP) Denny Hamlin (11) and Martin Truex Jr., (19) lead the field at the start of the NASCAR Cup series auto race in Richmond, Va., on Sept. 11, 2021. (Steve Helber / AP)

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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.

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