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.

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 ...

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 ...