LOS ANGELES — Patients with severe COVID-19 disease who develop respiratory failure have malfunctions in their immune systems that distinguish them from other COVID-19 patients, according to a new study led by Cedars-Sinai. The findings could help doctors develop new…

President Donald Trump arrived at the hospital Friday after he and first lady Melania Trump tested positive for COVID-19, following the announcement that his top adviser, Hope Hicks, tested positive. Vice President Mike Pence and his wife Karen tested negative for…