U.S. Tightens Rules on Risky Virus Research NYT: Science By: Carl Zimmer and Benjamin Mueller 7 May 2024 at 11:42 A long-awaited new policy broadens the type of regulated viruses, bacteria, fungi and toxins, including those that could threaten crops and livestock. ยฉ Karen Ducey/Getty ImagesWorking inside a biosafety Level 3 lab at the University of Washington School of Medicine in 2020.