As the number of people fully immunized against COVID-19 rises into the hundreds of millions, immunologists and infectious disease experts now are pondering a new question in the unfolding pandemic.
Doctors are seeing such cases around the world: About a third of COVID-19 patients go on to develop "long-haul" neurological or psychiatric conditions months after being infected, new research shows.
The mRNA vaccines from Pfizer and Moderna have proven to be potent weapons against COVID-19 infection among health care workers, first responders and essential workers in the real world, a new U.S. government study shows.
