• A recent article (‘Swirling sands,’ March 26) misstated a fact. A friend drove Jennifer Bouvette to the hospital on the night of Jan. 30.

• A caption in the March 12 cover story on vaccines, “The vexing vaccine debate,” incorrectly identified the cause of whooping cough in a caption above a gram-stained micrograph. Pertussis is caused by a bacterium.

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