A Japanese journalist who spent two months in Ebola-ravaged Liberia was found with a fever at Tokyo's Haneda airport on Monday.
Craig Spencer was in contact with several friends prior to developing a fever and testing positive for Ebola.
“The patient being monitored in isolation has thankfully been symptom-free for the last 24 hours,” New Jersey's Health Department said.
Illinois has also introduced a quarantine policy for "high-risk" travelers coming from West Africa.
The nurses did not press Duncan on the details of his travel history, something that could have alerted them to his exposure to the virus.
The boy was vomiting and had a 103-degree fever. His family is being quarantined in their apartment.
New York, New Jersey and Illinois implemented a mandatory 21-day quarantine aimed at people returning from Ebola-hit countries.
Several people have been tested for Ebola in Australia, but so far, no cases have been reported in the country.
Asymptomatic health care workers returning from Africa are to be monitored from home.
Quarantined Ebola nurse Kaci Hickox says she has hired a lawyer to challenge her mandatory isolation.
Samantha Power's trip comes as three U.S. states begin mandating quarantines for health workers returning from the Ebola-stricken region.
The U.S. Ambassador to the United Nations is visiting West Africa, as more stringent quarantine regulations take hold in some states.
Blood transfusions from survivors of the virus have been used in the past to treat those still suffering from the disease.
Symptoms worsen for New York City's first confirmed Ebola patient, though health officials say that's not unexpected.
After spending a month fighting Ebola in Sierra Leone, a nurse who tested negative for the disease calls for more "humanity" toward returning health care workers.
Craig Spencer became the first confirmed Ebola case in New York Thursday.
The U.S. National Institutes of Health declared the recovery of Nina Pham, a nurse who contracted Ebola while treating Thomas Eric Duncan.
The president did not mention the mandatory quarantines of so-called high-risk travelers announced by two state governors.
A 2-year-old who died from Ebola virus disease traveled on a bus while she was symptomatic and likely infectious.
The unidentified woman had been working with the group Doctors Without Borders in treating Ebola virus disease patients in Sierra Leone.
The CDC recommends survivors abstain from sexual activity for at least three months after the onset of Ebola symptoms.
"A voluntary Ebola quarantine is not enough," said Cuomo. He and Christie imposed mandatory quarantines for travelers at high risk for Ebola.