Coronavirus

Multiple schemes for “unblinding” trial participants provoke scientific and ethical debate that FDA must resolve quickly

Life-threatening responses seen in at least eight people could be linked to polyethylene glycol, known to trigger reactions to some drugs

European countries impose travel bans as scientists probe whether new strain spreads faster or causes more severe COVID-19

Analysis implicates a new COVID-19 genetic risk factor humans may have gotten from our extinct relatives

Cats, dogs, and other animals can get the pandemic coronavirus, but vaccine efforts are not moving at warp speed

Swiftly developed vaccines may curb COVID-19, even as second pandemic of misinformation rages

Unexpected evidence that SARS-CoV-2 can integrate its genetic material could explain puzzling diagnostic tests in recovered COVID-19 patients

Extra chromosome carries key genes that may work against them

Rich countries snapped up limited supplies, so protection will lag for others

Nation already suffers from high rate of bacterial disease

Unexpected immune response to HIV protein fragment in vaccine produced antibodies that could confuse screening tests for the AIDS virus

Despite a few misgivings,the advisory body said the vaccine’s strong efficacy clearly made its benefits greater than its risks

Hugo López-Gatell Ramírez bolstered the country’s health system but rejected universal testing

UAE health ministry reports 86% protection against infections in trial, but offers little data

The federal government may set vaccine priorities, but one leader of a hospital system says she and others on the ground need flexibility to allocate limited doses

But decision to prioritize failed hydroxychloroquine treatment draws criticism