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Contamination Likely Caused Critical Delay Of CDC Coronavirus Testing: Report

Positivity     50%   
   Negativity   50%
The New York Times
SOURCE: https://www.huffpost.com/entry/coronavirus-test-cdc-contamination-delay_n_5e9b63efc5b635d25d6d87b5
Write a review: The Huffington Post
Summary

The CDC didn't follow standard procedures, leading to the contamination of the first batch of testing kits, according to a Washington Post investigation.

As said here by Carla Herreria Russo