DEATHS FROM AIDS DECLINE SHARPLY IN NEW YORK CITY
Dr Mary Ann Chiasson, Asst Health Comr in New York City, reports deaths from AIDS dropped sharply in NYC last year, declining 30%, for first time since AIDS epidemic was recognized in 1981; says that number of people who died from disease fell to 4,944 in 1996, from 7,046 in 1995, and the decline occurred in all ethnic groups and in both sexes; for unknown reasons drop was greater among men than women; Chiasson asserts that most likely explanations for decline are advances in therapy introduced in early 1990's and expanded access to medical care and services made possible by surge in government money in 1994 (M)