When it came to the results of nationwide antibody tests—which analyze a person’s blood to detect any signs that their immune system had responded to an infection, indicating whether or not they had COVID-19—Redfield said of undiagnosed cases, “A good rough estimate now is 10 to 1.” He explained that between five percent and eight percent of Americans have been infected with the coronavirus, which means at minimum, 90 percent of people in the U.S. haven’t been infected and therefore remain susceptible to the virus.ae0fcc31ae342fd3a1346ebb1f342fcb The staggering revelation came after states like Arizona, Texas and New Mexico announced that they were putting reopening plans on pause in an attempt to contain the spread. Some medical experts, however, say such efforts aren’t going to cut it and that far more drastic measures need to be taken. Speaking to CNN on Friday morning, Peter Hotez, MD, of Baylor College of Medicine in Houston, said the country is in a “heartbreaking situation,” and one that requires immediate action. “We have to save lives at this point,” he added. RELATED: For more up-to-date information, sign up for our daily newsletter. Rising cases numbers have been reported all around the country since states begin reopening—noticeably picking up steam after Memorial Day, just as some doctors predicted. “Every epidemiologist was telling, screaming as loud as we could, that three weeks after Memorial Day, we’d have a peak in the cases, and five weeks after Memorial Day we’d begin to see a peak in hospitalizations and deaths,” epidemiologist Larry Brilliant told CNN. “If you let everybody out without face masks and without social distancing in the middle of a pandemic, this is what was predicted.” And for more on what’s driving the most recent COVID-19 outbreaks, check out This One Thing Is Spreading Coronavirus Faster Than Anything Else.