"This is all very reassuring as far as infection risk to the general public", Arwady said.
The agency says that it expects there will be additional reports of the virus in the USA in coming weeks, but that it considers the overall risk of this outbreak to the American public to be "low" at this point in time.
At present, the vast majority of cases have been diagnosed in people who live in or traveled to Wuhan, China.
There will likely be more cases of the virus in China and elsewhere, he said.
The Chicago woman returned from Wuhan a week ago and has mostly stayed in her home since returning from that visit. Health officials in Alameda County reveal patients in the Bay Area have been tested for the coronavirus.
Tick tock tick tock: Doomsday Clock nears midnight
But we seem to be missing something kind of important for a species - we don't appear to be too concerned about self-destruction. Humanity is now the closest it has ever been to total annihilation.
The United States Centers for Disease Control and Prevention (CDC) on Friday confirmed a second USA case of the new coronavirus from China in a Chicago woman, and said as many as 63 potential cases were being investigated as the sometimes-deadly illness continues to spread around the globe.
Chinese police officers wear protective masks as they patrol before the Chinese New Year at a Beijing railway station in Beijing, China on January 23, 2020. According to the CDC, an investigation into the incident is ongoing.
Late on Thursday, the Civil Aviation Authority of Vietnam (CAAV) said it had suspended all flights between Wuhan and Vietnam, and ordered domestic airports to step up screening measures to detect possible fever-like symptoms in travellers.
According to the CDC, the airports were selected because they see the largest number of arrivals from Wuhan, Hubei Province.
"Although there are now no vaccines available for this disease, there are certain actions you can take to help protect yourself and those around you", the notice to students said.
The virus - a "novel coronavirus" dubbed 2019-nCoV, belongs to the same family as severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS).
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Despite sharing some symptoms that were similar to SARS (such as fever, dry cough and shortness of breath), there "are some important differences", such as the absence of upper respiratory tract symptoms like runny nose, sneezing and sore throat and intestinal symptoms like diarrhea, which affected 20% to 25% of SARS patients, lead author Bin Cao, from the China-Japan Friendship Hospital and the Capital Medical University, both in Beijing, said in a statement.
Infected people have been reported in 29 provinces of China, along with the special administrative regions of Hong Kong and Macao.
The spread of a deadly virus known as the novel coronavirus by health authorities has already resulted in 883 confirmed cases of people being infected and 26 cases of lethal outcome.
Initially, there was only one case of the coronavirus reported in the United States, which has since expanded to numerous reported cases.
"In 14 days' time (4 February 2020), our model predicts the number of infected people in Wuhan to be greater than 250 thousand (prediction interval, 164,602 to 351,396)..."
U.S. boosts screening for new coronavirus
Two men aged in their 60s have died in China after being struck by the virus, which is understood to have broken out in Wuhan . They say they're introducing tighter checks at three global airports before the Chinese holiday season begins next week.