The FDA authorized the first breathalyzer test that detects COVID-19.
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Coronavirus was declared a Public Health Emergency of International Concern by the World Health Organization (WHO).
US President Joe Biden announced that Americans no longer needed to wear masks against COVID-19, following guidance released by the CDC.
The price of a barrel of crude oil dipped below zero.
British Prime Minister Boris Johnson was taken to hospital after testing positive for COVID-19.
The FDA approved the first chickenpox vaccine.
