The mayor, for the second day in a row, forcefully defended the city's response to the Legionnaires' outbreak in the South Bronx and said politicians critical of the administration's performance should keep their mouths shut. NY1's Grace Rauh filed the following report.

The scope of the Legionnaires' outbreak in the south Bronx is even bigger than before, but city officials say there have been no new diagnoses of this type of pneumonia since August 3.

"The outbreak is contained," said Mayor Bill de Blasio. "And that key fact: no new cases over the last 10 days."

The mayor delivered the news at Lincoln Hospital. It was one of the first buildings in the area with a rooftop cooling system that tested positive for the bacteria that causes the disease. He thanked the hospital staff for their work treating sick patients.

"You were the soldiers who went to the front to confront it and beat it back," de Blasio said.

The mayor was also eager to ensure his own administration won praise for its work as well. In recent days, some politicians have criticized the city's response as too slow, arguing that City Hall was caught off guard.

"In situations where there's public concern and there's a level of scientific or medical knowledge necessary to address the issues, I think politicians should step back," de Blasio said. "I think that politicians need to learn to help the public by letting the experts do the talking."

It's a bit of a sore spot for de Blasio, who is trying to convey to the public that his administration has been in control of this outbreak since day 1. To that end, the mayor leaned heavily on a doctor from the U.S. Centers for Disease Control and Prevention.

"If I were to characterize the response of the Health Department, I would describe it as swift, very diligent and robust, while at the same time, and this is very important, being open-minded and flexible," said Dr. Matthew Moore of the CDC.

The mayor seemed so pleased to have the federal doctor by his side that de Blasio even asked him a few questions of his own.