Cases in Arizona aren't as high as other states, but health experts are reporting a steady stream of patients testing ...

On Friday, the World Health Organization categorized a new strain of COVID-19 that was recently detected in southern Africa as a "variant of concern." The WHO's Advisory Group on SARS-CoV-2 Virus ...

Mark Cameron was part of the rapid-response research team when the SARS (Severe Acute Respiratory Syndrome) outbreak hit Toronto in the early 2000s. Now a faculty member in Population and Quantitative ...

LONDON — New strains of Covid-19 are spreading globally, raising concerns among health professionals about a possible summer spike in cases, four-and-a-half years since the onset of the pandemic.