Pfizer/BioNTech and Moderna pledged Tuesday to boost their current distribution of COVID-19 vaccines. Currently, the companies are distributing 4-5 million vaccine doses each week. Pfizer plans to up that to 13 million doses weekly by mid-March, and Moderna is working to distribute 40 million doses per month, the companies told the House Energy and Commerce Committee. Moderna plans to ship at least 100 million doses by the end of May. The increased production promises come amid a sluggish coronavirus vaccine rollout. The U.S. gave out an average of 1.45 million vaccines each day in the week of Feb. 10-17. Both Moderna and Pfizer are testing booster shots that may work better against more transmissible COVID-19 variants. Moderna is testing its vaccine's efficacy on adolescents and hopes to distribute it to them by the fall.

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