José Rafael Peralta was born on Nov. 10, 1971, in New York City, to parents who had emigrated from the Dominican Republic. He had been ill for at least two weeks, but had been reluctant to visit a doctor, according to Chris Sosa, his director of communications. After much prodding he finally went for an exam recently, and he had a follow-up scheduled for December. “It was like pulling teeth to get him to talk about not feeling well,” Mr. Sosa said. “He just thought he was having symptoms related to getting the flu shot.” Mr. Peralta was at home with his family on Wednesday night when he became disoriented. He was taken to the hospital, where he died at 9:23 p.m., Mr. Sosa said. An autopsy is scheduled.