A 5-year-old Bronx boy hospitalized with Ebola symptoms tested negative for the deadly disease Monday. The test results means New York City still has just one confirmed case of the dreaded disease — and the Soundview section, where the boy lives with his family, can breathe a big sigh of relief. The boy, who recently returned from Ebola-wracked West Africa, had a “low grade” fever when his temperature was taken at 7 a.m., officials said.