The results are based on blood samples taken from adults one week after they received the updated booster. The FDA also authorized Moderna's updated booster based on similarly limited data. The FDA authorized the updated shots based on studies in mice — plus human trial results from a similar booster that targets the original omicron strain, called BA.1. At the time, Dr. Peter Marks, the FDA's top vaccine regulator, said the agency hoped the updated vaccines will provide stronger protection against symptomatic disease than the older vaccines. Moderna didn't immediately respond to a request for comment about when it will release new data on its updated booster.

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