Dr. Thomas Frieden, head of the CDC in Atlanta and former health commissioner of New York, was commenting on a report scheduled to be released this week.
"In New York City, where we had a lot of H1N1 this last spring, the estimate is about 800,000 people -- about 10 percent of New York City residents -- got infected with the flu," Frieden said in an interview telecast on C-SPAN. "That's a lot of people."
New York Mayor Michael Bloomberg is scheduled to hold a news conference Tuesday -- along with Farley, New York schools chief Joel Klein and others -- to outline the city's H1N1 plans, the New York Daily News reported.
Since April, swine flu killed 47 people in New York -- less than 1 percent of those infected -- but since July, there have only been pockets of flu activity, health officials said.