The authorities said that the virus had been diagnosed in a man arriving from the Democratic Republic of Congo and that they were taking measures to prevent any spread.
The Kenyan cabinet secretary for health, Aden Duale, at a news conference in Nairobi on Tuesday. He said the man with Ebola had lived in Congo for seven years, and fell sick a month ago.
What happened in Mangala, where residents were left with little outside support, helps explain how this outbreak became the worst seen in the Democratic Republic of Congo.