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New York is "fully prepared" to handle Ebola, the city's mayor said Friday, after a doctor who treated patients in epidemic-hit Guinea tested positive for the deadly virus. "There is no cause for alarm," Mayor Bill de Blasio told a news conference. "New Yorkers need to understand the situation is being handled and handled well." He spoke one day after the 33-year-old doctor, who returned last week from Guinea, tested positive for the disease, which has already killed .