“We are now seeing a rising tide of flu in many parts of New York City,” said New York City Health Commissioner Thomas R. Frieden earlier Sunday.

“With the virus spreading widely, closing these and other individual schools will make little difference in transmission throughout New York City, but we hope will help slow transmission within the individual school communities.”

An New York middle school assistant principal who was hospitalized with the H1N1 virus, commonly known as swine flu, died Sunday apparently from flu complications, a hospital spokesman said.