Natural Immunity Might Be Slowing COVID-19, but Arizona Is Far From Herd Immunity

In recent weeks, Arizona and Pima County have seen a record surge in the rate of positive serology tests. At the same time, COVID-19 cases recently dipped from one week to the next. Both metrics, however, still remain at high levels. "It's probably accurate in the sense that ... more Arizonans have been infected and recovered. I think that's an obvious statement that serology doesn't necessarily need to help us answer," said Joe Gerald, an associate professor at the University of Arizona's Mel and Enid Zuckerman College of Public Health.