Making Sense of the Different Types of Tests for Covid-19

Health officials are looking to use these tools more often and in new ways, such as identifying variants that could pose a greater risk and gauging the immunity of individuals to the coronavirus.

U.S. President Joe Biden plans to send up to 500 million so-called rapid antigen tests to Americans’ homes for free to confront a resurgence in new infections. The rise of the omicron variant of SARS-CoV-2 has refocused attention on the importance of testing as a tool for bringing the pandemic under control — and keeping it that way. Here’s help sorting it out. The terminology around coronavirus testing can be confusing.

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