Why Contact Tracing Is Failing in Many States.

Contact tracing, a cornerstone of the public health arsenal to tamp down the coronavirus across the world, has largely failed in the United States; the virus’s pervasiveness and major lags in testing have rendered the system almost pointless. In some regions, large swaths of the population have refused to participate or cannot even be located, further hampering health care workers.

“We are not doing it to the level or extent that it should be done,” said Steve Adler, the mayor of Austin, echoing the view of many state and city leaders. “There are three main reasons. One is the sheer number of people, the second is the delay in getting test results back, the third is the wide community spread of the disease.”

The goal of contact tracing for Covid-19 is to reach people who have spent more than 15 minutes within six feet of an infected person and ask them to quarantine at home voluntarily for two weeks even if they test negative, monitoring themselves for symptoms during that time. But few places have reported systemic success. And from the very beginning of the U.S. epidemic, states and cities have struggled to detect the prevalence of the virus because of spotty and sometimes rationed diagnostic testing and long delays in getting results.

“I think it’s easy to say contact tracing is broken,” said Carolyn Cannuscio, an expert on the method and an associate professor of family medicine and community health at the University of Pennsylvania. “It is broken because so many parts of our prevention system are broken.”...https://www.nytimes.com/reuters/2020/07/31/technology/31reuters-health-ooronavirus-apps.html?searchResultPosition=2https://www.theglobeandmail.com/canada/article-ottawa-launches-covid-alert-app-that-notifies-users-about-contact/