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Unexpected rise of 'decidual cast' searches after COVID vaccine launch

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In late January, 2021, just a month after the Pfizer and Moderna COVID-19 vaccines were granted Emergency Use Authorization (EUA) by the Food and Drug Administration (FDA) in December 2020, a dramatic change in Google trend searches for “decidual cast” was evident.

Another surge in interest occurred in mid-June 2021, a month after the Pfizer vaccine was granted an expanded EUA for adolescents ages 12–15 years.