Covid-19 vaccine from Pfizer and BioNTech shows positive results

An experimental Covid-19 vaccine being developed by the drug giant Pfizer and the biotech firm BioNTech spurred immune responses in healthy patients, but also caused fever and other side effects, especially at higher doses, STAT News reports...

The Pfizer/BioNTech vaccine, like the Moderna vaccine, is based on a technology called messenger RNA, which uses a key genetic messenger found in cells to create protein that the immune system then learns to attack...