Nearly 15,000 cases of the deadly coronavirus were reported in one Chinese province on Thursday — a jump officials in the country said was linked to how they’re diagnosing new cases, a report said.

The 14,840 new cases in Hubei province were recorded because officials stopped using kits to diagnose patients and instead began counting patients who have been screened and identified by doctors, the New York Times reported.

In addition to the new cases, 242 new deaths were reported in the province on Thursday local time, according to the report.

In the United States on Wednesday, the CDC confirmed a 14th person — who is now under quarantine in California — has been infected by the virus.

The patient, who was not identified, was among a group of people who returned from China on a State Department chartered flight, the agency said.

“At this time there is no indication of person-to-person spread of this virus at the quarantine facility, but CDC will carry out a thorough contact investigation as part of its current response strategy to detect and contain any cases of infection with this virus,” the agency said in a statement.