Our reporters spoke to dozens of people for this article, including regulators, doctors, researchers, patients, public health officials, and test makers, to understand the state of antibody testing. Here’s what they found:

Many scientists and political leaders say the country is nowhere close to deploying enough diagnostic and antibody tests at the speed and volume required to lift lockdowns and reopen the U.S. economy.

The FDA eased its rules and allowed antibody tests, many made in China, to be sold in the U.S. without formal review. The agency has since warned that some firms marketing antibody tests falsely claimed that they had federal approval or that they could diagnose Covid-19.

Marketed to doctors and businesses so that they can screen workers, some rapid antibody tests cost $60 to $115 and are easy to administer. But they are also the most unreliable — so much so that the WHO recommends against their use.

Accurate antibody testing will be essential to reopening the U.S., political leaders and some health officials have said. But testing is unlikely to meet expectations anytime soon.

Read our full investigation into the state of antibody testing in the U.S. by @steveeder , @mega2e and @apoorva_nyc

@nytimes It's clear that the number of people with antibodies who already had this is far more than the liberal media is telling us.

@nytimes

@nytimes This article is now punctuated courtesy of Typos of the New York Times:

@nytimes So basically the only way you'd be a free citizen is if you got the virus and didn't die?

@nytimes "The lockdown formula is a proven method I use to successfully help support my 91yr old mom. It's also the same formula my mentors have been using the past few years to help them produce massive results!" for more click here

@nytimes The New York Times needs to be shut down and destroyed y'all can't print anything but fake news everybody involved

@nytimes Antibody tests aren't the most accurate-knew this from Chinese media 1-2 mo ago.Chinese Fangcang hospitals would test a patient multiple times and only release her when all results are negative.Why not cover this earlier? Guess b/c @amyyqin @LiYuan6 were busy politicizing things.