NASHVILLE, Tenn. (AP) — A laboratory processing Nashville coronavirus tests did not report the results of 312 infections to the city for weeks, the Tennessean reported.
The delay hampered the city's contract tracing efforts and led to an artificial case spike as the results were added to Wednesday and Thursday's totals.
Dr. Alex Jahangir, the leader of Nashville's coronavirus task force, said the city doesn't know if the test results were reported more quickly to the infected individuals.
The city sends test samples to labs, then the lab sends results to the Tennessee Department of Health which relays them to the Nashville Metro Public Health Department. People who are tested get their results directly through a web portal updated by the lab.
"It could be that part of those people got delayed results and they weren't aware they were positive," he said. "Our hope is, if somebody was getting a test … they would self-isolate until they get results."
It was the third time Nashville test results were delayed by American Esoteric Laboratories, a company that until recently processed samples from test sites run by the city. Jahangir said the delay was one of the reasons the city recently replaced AEL with a new company, Pathgroup, which had "tremendously" reduced the wait times.
The delayed reporting from tests dating as far back as mid-June may have set back the city's efforts to slow an escalating outbreak. Nashville employs contact tracers to investigate the source of infections and identify clusters, but they can't trace infections if they don't know they exist. And those infected individuals may have been spreading the virus unknowingly for weeks.
The error also represents the larger challenge of an U.S. outbreak that has strained testing and tracing efforts across the country. Coronavirus is surging in many states, and most of them depend on a small group of laboratories to process millions of tests.
"We have heard of delays of seven, 10, and sometimes even 12 days to get results back from a test. That's unacceptable," Tennessee Health Commissioner Dr. Lisa Piercey said on Wednesday. "We can't get patients back to work and we can't get contact tracing started until we get that result back in."
The delayed cases on Thursday contributed to a single-day total of 688 new infections, the highest ever reported in the city.
During a call with Metro Council members, Nashville Health Director Michael Caldwell said the escalating virus had challenged the city's team of 125 contact tracers. The team will respond to recent surge of infection with a "blitz" of emergency tracing, he said.