Tom Friedrich, professor of virology at the University of Wisconsin-Madison’s School of Veterinary Medicine, said more details are needed to understand what led to the patient’s death. But he pointed out that other countries have already seen deaths caused by similar H5N1 viruses, especially in people who are sick enough to be hospitalized.
“There’s over 50 percent case fatality when people have these severe infections,” Friedrich said. “So it’s not unheard of in other parts of the world, even though this is the first time it’s happened in the United States.”