Knee injury rules Lionel Messi out of PSG-Metz game midweek

PSG's Lionel Messi looks at PSG's head coach Mauricio Pochettino after he was substituted during the French League One soccer match between Paris Saint-Germain and Lyon at the Parc des Princes in Paris, on Sept. 19, 2021. (Francois Mori / AP) PSG's Lionel Messi looks at PSG's head coach Mauricio Pochettino after he was substituted during the French League One soccer match between Paris Saint-Germain and Lyon at the Parc des Princes in Paris, on Sept. 19, 2021. (Francois Mori / 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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