Public health experts say that the slow pace of U.S. testing makes it hard to know how quickly the virus is spreading and has stymied efforts to contain it.

Administration officials told lawmakers yesterday that the U.S. tested about 11,000 people during the first seven weeks of the outbreak – roughly as many as South Korea is testing each day. About 1,700 people in the U.S. have tested positive for the virus.

Former FDA chief Scott Gottlieb said the “very significant” moves would increase the country’s testing capacity “by tens of thousands a day” by the end of next week. The Roche system can process up to 4,100 samples a day and returns results in three and a half hours, the company said.

Problems with U.S. testing became apparent in early February, when public health labs across the country reported that they could not validate a coronavirus test developed by the CDC. The FDA eventually approved a simplified version of the test, and authorized public health labs to create their own tests in-house.

But confusion over who should be tested and shortages of crucial materials for preparing samples have complicated efforts to ratchet up the number of people being screened.

Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, acknowledged the ongoing problems with testing in a television interview on Friday morning. But he said that, with the growing involvement of the private sector in the testing process, “it’s going to be markedly improved.”

“The companies that generally do these kinds of tests for a living are now going to be major-league involved in getting this available to the public,” Fauci said. “Whereas before, it was mostly on the burden of the CDC as a public health organization."

Fauci declined to put a specific timeline on when the testing backlog would improve, but he indicated it would ramp up dramatically within days.

“Right now, the FDA, Secretary Azar, the CDC, all of us together have been now pushing with the task force, so that within -- and I would say, you know, it's dangerous to give times, but I would think within a week, we're going to start seeing a real acceleration of testing,” he said.

The administration also tapped a new “czar” housed at the Department of Health and Human Services, putting Adm. Brett Giroir in charge of coordinating testing efforts among public health service agencies.

Giroir, a medical doctor, is the assistant secretary for health and head of the Public Health Service within HHS and briefly served as acting chief of the FDA last year.

HHS Secretary Alex Azar has specifically tasked Giroir with improving coordination between the CDC and the FDA, “as well as state and local public health authorities and private or public clinical laboratories,” according to an HHS official.

“A key priority is to ensure that patients, doctors, and hospitals can access tests seamlessly and with maximum ease, and Dr. Giroir will lead efforts to execute on that goal,” Azar said in a statement.

Under the new arrangement, CDC Director Robert Redfield and Commissioner of Food and Drugs Stephen Hahn “will report to the secretary through Dr. Giroir for all issues and activities associated with COVID-19 diagnostic testing,” the HHS official said.

Quint Forgey contributed to this report.