The state of the hunt:The European Union and India made new moves to curtail vaccine exports.
COVAX warned of delivery delays.
Pfizer and BioNTech launched a pediatric trial of their vaccine in children as young as 6 months.
Approved or authorized vaccines
New data, new questions for AstraZeneca: If AstraZeneca thought higher-than-expected efficacy results this week from the U.S.-based Phase 3 trial of AZD1222 would…