The company is one of the leading contenders in the race to develop a vaccine against the virus that has killed more than 820,000 people worldwide. Its candidate, mRNA-1273, is already in late-stage human trials testing its ability to safely prevent infection.
Health officials have been concerned about whether vaccine candidates would work in older people, whose immune systems typically do not respond as strongly to vaccines. Dr. Jacqueline Miller, Moderna's head of infectious disease development, told a U.S. Centers for Disease Control and Prevention panel the company plans to post weekly updates on enrollment of Black and Latino trial subjects on its website.
Dr. Nancy Messonnier, director of the CDC's National Center for Immunization and Respiratory Diseases, questioned Pfizer's plans after the company said its vaccine must be stored at ultra-low temperatures for up to 6 months or in specially designed shipping containers for up to 10 days.
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