In quality assurance tests, some labs are reporting that the screening kit is returning inconclusive results on cell samples that should come back positive or negative.
If the end of the outbreak is in the offing, Messonnier said it was likely down to the "aggressive actions" - including travel restrictions and quarantines - taken by China, the United States and other affected countries.
Information of the an infection comes as the primary batch of evacuees plans to be launched on Tuesday from the March Air Reserve Base.
Over 800 people have been evacuated from Wuhan on six USA evacuation flights since January 28. The woman had her sample taken at the hospital, where she was being observed for a cough.
There are a large number of specimens being processed at the Atlanta-based agency, Dr. Nancy Messonnier, a director at the agency, told reporters in a phone call on Wednesday.
The response, to date, has included the distribution of test kits capable of identifying COVID-19 to public health laboratories across the country, which began last week. Any time a person tests positive for a communicable disease such as novel coronavirus, public health departments work to interview anyone they came in contact with isolating those who might have become infected.
The Post said it's not clear how long the person was out of the hospital. "The patient was wearing a mask per CDC instruction".
The patient also did not interact with the environment after leaving the hospital initially, officials said, according to the Post.
UC San Diego Health, a regional analysis hospital that makes a specialty of lethal and infectious illnesses, launched four sufferers Sunday after the Center for Disease Control knowledgeable the hospital that the sufferers had examined adverse for coronavirus.
UCSD said it has now reached a new level of label literacy with its federal counterpart. But based on what they've learned so far, they say it appears unlikely anyone else is at risk. "They didn't match exactly".
"Both patients are doing well and have minimal symptoms", the medical center said per the news organization.
Approximately half of all people who were on board the Diamond Princess are from Japan, while more than 400 passengers are from the United States, according to the cruise line spokesperson.
Based on the San Diego Union-Tribune, the four sufferers had been transported to the Marine Corps Air Station Miramar in San Diego, California, the place they had been beforehand held underneath federal quarantine together with over 200 Individuals coming back from China.