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As many as half a million at-home COVID tests are being recalled due to potential bacterial contamination.

The recalled tests are a variety called SD Biosensor, Inc. Pilot COVID-19 At-Home Tests. They were distributed by maker Roche Diagnostics to retailers CVS Health and Amazon, according to the FDA.

Accidental contact with the liquid in the test kit poses an infection risk, particularly for people with weakened immune systems. A recalled test also may have given an incorrect result, with the potential for a false positive or a false negative reading.

None of the recalled tests were distributed as part of the federal government’s free COVID test program that delivered tests to people’s home by mail after ordering at COVID.gov. Head over to WebMD to read the full story.