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As the latest wave of the coronavirus ebbs in most parts of the United States, advisers to the Centers for Disease Control and Prevention are meeting on Thursday to evaluate which Americans need extra doses of the coronavirus vaccines made by Moderna and Johnson & Johnson.

In the first major presentation in the meeting, representatives from Moderna presented evidence in support of a booster dose of 50 micrograms, half the dose given in the initial rounds of immunization.

The smaller dose is enough to rouse the immune system because “the memory immune system is starting from a different place than it was the primary series,” said Dr. Jacqueline Miller, a senior vice president at Moderna who presented the data. Head over to The New York Times to read the full story.