A unit of Abbott Laboratories is recalling two Covid-19 laboratory test kits as they can potentially issue false positive results, the U.S. Food and Drug Administration said on Oct. 14.

A Covid-19 vaccine being developed by CSL Ltd. and the University of Queensland was scrapped after numerous vaccine recipients reported receiving false positives on certain HIV tests, according to the Wall Street Journal.

The U.S. Food and Drug Administration is alerting clinical laboratory staff and healthcare providers that false positive results can occur with Covid-19 antigen tests.

Becton Dickinson is investigating reports from U.S. nursing homes that the company’s rapid coronavirus testing equipment is producing false-positive results.