WASHINGTON, Jan. 1 (TNSRes) -- The U.S. Department of Health and Human Services' National Institutes of Health issued the following news release: In an in-depth study of how COVID-19 affects a patient's brain, National Institutes of Health researchers consistently spotted hallmarks of damage caused by thinning and leaky brain blood vessels in tissue samples from patients who died shortly after contracting the disease. In addition, they saw no signs of SARS-CoV-2 in the tissue samples, suggestin  more