NB: The toy math example to show how calculations of False Discovery Rate lead to bias in favor of false positives, an error has been corrected. Corrections and changes are in bold. The original article references to ‘false positive rate’ will also be updated to ‘false discovery rate’. We thank our readers for catching those errors!

It has been one of the most enduring Covid conspiracy theories: that the 'gold standard' PCR tests used to diagnose the virus were picking up people who weren't actually infected.

A large Covid-19 testing company in the UK is being investigated by the country’s privacy watchdog over plans to sell swabs containing customers’ DNA for medical research.

The U.S. Food and Drug Administration has announced a recall of about 2 million at-home COVID-19 test kits made by the Australian-based biotech company Ellume.