Thomas Frieden. Credit: C. HONDROS

Thomas Frieden, New York City's health commissioner, has been appointed head of the US Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia.

Frieden worked for the agency from 1990 to 2002, when his work included tackling the spread of multidrug-resistant tuberculosis in India. In New York, he has worked to reduce tobacco use and to develop emergency-response plans in case of a pandemic. Back at the CDC, he will take over an agency on the front lines of battling the H1N1 swine-associated influenza outbreak.

During the 1990s, Frieden worked for another New York health commissioner: Margaret Hamburg, who on 18 May received Senate confirmation to head the US Food and Drug Administration.

Frieden's appointment does not require Senate confirmation.