Pfizer says an early peek at its vaccine data suggests the shots may be 90% effective at preventing COVID-19, indicating the company is on track later this month to file an emergency use application with U.S. regulators.
Medical researchers are raising significant doubts about whether an agent of the human immune system causes some coronavirus patients to end up in the hospital with injured lungs and other organs, struggling to breathe. What remains is a continuing mystery about what causes certain people to die from Covid-19, and how best to prevent that.
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