(15.12.2021)
In January 2020, the C.D.C. developed a polymerase chain reaction, or P.C.R., test for the virus. (…)
Problems emerged soon after the C.D.C. had begun shipping its test kits out to public health laboratories in early February. (…)
In mid-February, the agency acknowledged that the kits were flawed, and in April, officials at the U.S. Food and Drug Administration said that poor manufacturing practices had resulted in contamination of the test kits.
The new paper presents the results of the C.D.C.’s own internal investigation into the problems with the tests.
(…)
The investigation also confirmed that the test kits had been contaminated with synthetic fragments of the virus’s genetic material.