| | Bernie Sanders and nine other Democratic senators urged President Joe Biden on Friday to back a temporary patent waiver for COVID-19 vaccines that would allow countries to manufacture treatments locally and accelerate the global vaccination effort. | | | Scientists at Johnson & Johnson (JNJ.N) on Friday refuted an assertion in a major medical journal that the design of their COVID-19 vaccine, which is similar AstraZeneca's (AZN.L), may explain why both have been linked to very rare brain blood clots in some vaccine recipients. | | | The following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for COVID-19, the illness caused by the virus. | | | CHICAGO (Reuters) - Scientists at Johnson & Johnson on Friday refuted an assertion in a major medical journal that the adenovirus-based design of their COVID-19 vaccine, which is similar AstraZeneca's, may explain why both have been linked to very rare brain blood clots in some vaccine recipients. | | | France passed the grim milestone of 100,000 people dead from COVID-19 this week, but a warden at a Paris cemetery has already been witnessing the death toll as she oversees a constant procession of burials. | | | Mexico reported 4,504 new confirmed cases of COVID-19 and 480 more fatalities, bringing the country's total to 2,299,939 infections and 211,693 deaths, according to data from the health ministry released on Friday. | | | The United States has administered 202,282,923 doses of COVID-19 vaccines in the country as of Friday morning and distributed 258,502,815 doses, the U.S. Centers for Disease Control and Prevention said on Friday. | | | Thousands of vaccination slots in Stockholm earmarked for Sweden's oldest and frailest people are being passed on to younger patients, with critics accusing the region of failing to adapt the process for those not used to digital technology. | | | SAO PAULO (Reuters) - An emergency shipment of sedatives needed to intubate severely ill COVID-19 patients arrived in Brazil late on Thursday from China, as the South American country scrambles for supplies due to severe shortages of the vital drugs. | | | STOCKHOLM (Reuters) - Thousands of vaccination slots in Stockholm earmarked for Sweden's oldest and frailest people are being passed on to younger patients, with critics accusing the region of failing to adapt the process for those not used to digital technology. | | | | |