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UCLA FSPH research investigates COVID-19 case rates and pandemic protection

A metric for decisions to implement, continue, or relax measures

Monday, May 4, 2020

State and terrritorial governors have implemented pandemic protection measures in order to interrupt and slow down the passage of the coronavirus throughout each state’s population. Some of these measures are implemented at the individual level, such as wearing a facemask or maintaining social distance. The risk of transmission is much higher among crowds of people in close proximity, so another set of measures operates at the group level, trying to keep large groups from forming by keeping potential members dispersed.

“Romaine lettuce tainted with E. coli can be recalled or removed from grocery stores to prevent transmission,” said Paul Hsu, adjunct assistant professor of epidemiology at the UCLA Fielding School of Public Health. “When someone is infected with coronavirus, we have to rearrange social contacts to interrupt that person-to-person transmission.” Crowds at sporting events, audiences at concerts, and students in classrooms have been dispersed by cancelling games, events, and classes.

Some states implemented pandemic protection measures early in the pandemic, others later. The implementation of these measures saved lives, but created educational, economic, and social dislocations. The question facing our governors is when to begin to relax the measures, and how much. Too much too soon could lead to another outbreak of COVID-19 cases and subsequent deaths, requiring another round of potentially disruptive protective measures.

“While every state is different, the coronavirus does not respect state boundaries,” said David E. Hayes-Bautista, professor in the Fielding School’s Department of Health Policy and Management and director of the Center for the Study of Latino Health and Culture at UCLA. “A comparison of COVID-19 case rates is a logical place to start for all governors when assessing what to do with their pandemic protection measures.”

Hayes-Bautista, also a distinguished professor of medicine at the David Geffen School of Medicine at UCLA, pointed out the wide range of case rates, from over 15,000 cases per million population in New York to 435 per million in Puerto Rico.

“New York has around 35 times as many cases per million residents as Puerto Rico. This suggests that the respective governors may want to make different decisions about pandemic protection measures,” he said.

As another example, Michigan, with a case rate over three times higher than California’s, may want to consider a timetable different from that of the Pacific Coast state. Furthermore, depending on the progress of the flattening of the curve in those states, the relaxation of measures in one state could adversely affect the success of protection measures in a neighboring state.

Other factors besides the COVID-19 case rates—for example, hospitalization or death rates, testing availability, or health care capacity—may also influence the decision to implement, continue, or relax pandemic protection measures, but the comparative state and territory rates provide a starting place for the decision-making process, guided by basic public health precepts and based on uniform data.

written by Adriana Valdez

PDF icon Report State COVID-19 case rates 3.171.91 KB