The Centers for Disease Control published a controversial post on Twitter Wednesday, admitting that Americans who took a Covid-19 nasal swab PCR test may have had their DNA harvested.

"Remember that #COVID19 nose swab test you took?" the post reads. "What happened to the swab? If it was processed with a PCR test, there's a 10% chance that it ended up in a lab for genomic sequencing analysis. Learn more about the process and its importance."