Mask study retracted

The authors of a study on the ineffectiveness of masks in blocking SARS-CoV-2 have retracted their study in the Annals of Internal Medicine, a study we covered in Physician’s First Watch. They write: “We had not fully recognized the concept of limit of detection (LOD) of the in-house reverse transcriptase polymerase chain reaction used in the study (2.63 log copies/mL), and we regret our failure to express the values below LOD as ‘

Retraction notice in Annals of Internal Medicine