In this articleDXCMModerna Covid-19 Vaccine mRNA 2024-2025 formula.Courtesy: ModernaA version of this article first appeared in CNBC's Healthy Returns newsletter, which brings the latest health-care news straight to your inbox. Subscribe here to receive future editions.It's that time of the year again. A new round of Covid shots is on its way to Americans. The Food and Drug Administration last week approved updated mRNA-based vaccines from Pfizer and Moderna amid a relatively large summer surge of the virus ...