Five people in New York are currently waiting on test results to see if they have contracted the coronavirus connected to an expanding outbreak in central China, according to Governor Andrew Cuomo's office

There are no confirmed cases in the state to date. All told, the state Department of Health has identified nine people for testing. Four results have come back negative.

The news, part of a now-regular health department update delivered by Cuomo's office on Monday, comes amid increasing concern about the spread of the disease, which has killed at least 81 people and infected nearly 3,000 in China. Worldwide, the disease has reached 16 countries, including the U.S.

"These five individuals remain in isolation as their samples are tested at CDC," Cuomo said in the press release. "While the risk for New Yorkers is currently low, we are still working to keep everyone informed, prepared and safe."

Across the U.S., there are five confirmed cases of the disease. In a briefing on Monday morning, an official for the Centers for Disease Control and Prevention said 110 persons in 26 states are currently under investigation for testing. So far, 32 have tested negative.

While CDC officials are closely monitoring the situation, they described the immediate risk of infection in the U.S. as low. Currently, the CDC estimates that the coronavirus's R-naught, which is the average number of people infected from one other person, is between 1.5 and 3. The R-naught for measles, for example, is between 12 and 18.

Dr. Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases, said that all tests are being centrally processed by the CDC. However, the agency is working on developing diagnostic test kits for some states to use.

Local health officials as well as Mayor Bill de Blasio have said that it is only a matter of time before the coronavirus arrives in New York City, which has the largest Chinese community outside of Asia. Dr. Perry Pong, the chief medical officer of the Charles B. Wang Community Health Center in Chinatown, told Gothamist last week that he expects the cases to arrive in the following weeks after the Lunar New Year, when Chinese New Yorkers may be returning.

The incubation period, during which time a person may have coronavirus but not realize it, can last up to two weeks, according to officials. An infected person without symptoms may still be able to spread the virus during the incubation period without realizing it.

Although flights out of Hubei province, the source of the virus, have been stopped, some travelers may have traveled to and departed from other cities in China. The CDC is currently conducting screening at five airports, including John F. Kennedy in New York. New Jersey elected officials have called on the agency to also include Newark Liberty Airport.

City officials are urging any individuals who have recently traveled to the central Chinese region—or been in contact with someone who has—to contact a doctor immediately if they experience symptoms such as fever, cough, or difficulty breathing.