Polymerase chain reaction (PCR) and rapid (antigen) tests for COVID-19 both involve taking a swab. Results for a PCR test take longer, as it needs to go to a laboratory. It is more costly but tends to ...

More than two years after the World Health Organization (WHO) declared an end to the emergency phase of the Covid-19 pandemic ...

Kristen Haase receives funding from Health Canada and Roche to study rapid testing. Don D. Sin receives funding from Westjet/YVR to evaluate the feasibility of implementing rapid testing at airports.

Determined to proceed with parties and events this summer, hosts are adding screenings at the door. But such measures are hardly a guarantee of safety, medical experts warn. By Alyson Krueger Dr. Asma ...

Other countries are awash in Covid tests. The U.S. is not. By David Leonhardt Your daughter wakes up with a scratchy throat, and you can’t decide whether she should go to school. You can’t shake a ...