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FDA Commissioner Stephen Hahn at a White House briefing on March 19. Photo: Brendan Smialowski/AFP via Getty Images

The FDA blocked 29 manufacturers, many of which are based in China, from selling coronavirus antibody tests in the U.S. on Friday.

Why it matters: Antibody tests help medical workers find out how widespread the coronavirus is in a given community, even if someone is asymptomatic — which New York state has pursued in recent weeks.

Details: The FDA did not specify why the tests were barred from distribution in the U.S., but reasons include a test having significant problems or if an emergency authorization request is not submitted in time.

Flashback: The FDA "does not automatically independently verify performance" of antibody tests after granting them emergency authorization, the AMA wrote earlier this month — and tests that are not commercially marketed do not require FDA authorization.

Go deeper: CDC is conflating diagnostic and antibody tests for coronavirus

Go deeper

Aug 31, 2020 - Health

CDC report on COVID deaths underlines virus' danger

Continental Funeral Home in Los Angeles has been struggling to keep up with the demands of rising death rates during the pandemic. Photo: Robert Gauthier/Los Angeles Times via Getty Images

A new Centers for Disease Control report shows 94% of people who died from COVID-19 in the U.S. had contributing health conditions.

Yes, but: Australian epidemiologist Gideon Meyerowitz-Katz noted in a blog post on Monday that the CDC finds COVID-19 was the underlying cause of 95% of all deaths related to the virus. Only in 5% of deaths has it been listed as a contributing cause.

Updated Oct 7, 2020 - Health

World coronavirus updates

Expand chart
Data: The Center for Systems Science and Engineering at Johns Hopkins; Map: Axios Visuals

New Zealand now has active no coronavirus cases in the community after the final six people linked to the Auckland cluster recovered, the country's Health Ministry confirmed in an email Wednesday.

The big picture: The country's second outbreak won't officially be declared closed until there have been "no new cases for two incubation periods," the ministry said. Auckland will join the rest of NZ in enjoying no domestic restrictions from late Wednesday, Prime Minister Jacinda Ardern said, declaring that NZ had "beat the virus again."