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Measles outbreak--New York City, 1990-1991.

In March 1990, a large measles outbreak began in New York City. Through December 1990, approximately 2500 cases and eight measles-associated deaths were reported. However, since January 1991, transmission has increased; through May 7, more than 2000 cases and nine deaths were reported to the New York City Department of Health (NYCDH) in 1991.