If true, that suggests a cluster of cases with possible human-to-human transmission.
Bausch reported to the F.D.A. that a cluster of cases had emerged in Hong Kong.
Even then, he said, a natural source could cause a cluster of cases.
In 1999, for example, doctors noticed a cluster of cases of encephalitis around New York City.
A cluster of cases in Gansu Province in western China triggered the recall.
"We learned that in Garut," she said, referring to a cluster of cases last August in West Java.
They were part of a cluster of cases reported Sept. 7 by the World Health Organization.
A spokeswoman for the Illinois Department of Public Health said the agency was looking at a cluster of cases in the Chicago area.
If, in the next few weeks, more Ebola cases turn up on American soil, and, particularly, if a cluster of cases emerges, the politics could get very ugly.
The spectre of a new untreatable plague has concentrated minds because of the identification of a cluster of cases in KwaZulu Natal, in South Africa.
A cluster of cases that began in a Saudi hospital in April ultimately involved 23 people, including several family members and health workers.
