Emerging infectious diseases

Emerging infections
New infectious diseases
Re-emerging infectious diseases
Reemerging infectious diseases

Work cat.: 2003064588: Germ warriors : stories of the men and women who fight the world's worst diseases from tuberculosis to smallpox, c2003: CIP galley (emergence of new diseases; emerging infections)
Google search, Nov. 7, 2003 ("Emerging infectious diseases", overwhelming usage with 138,000 hits)
CDC journal: Emerging infectious diseases web site, Nov. 13, 2003 ("Infectious diseases whose incidence in humans has increased in the past 2 decades or threatens to increase in the near future have been defined as 'emerging.' These diseases, which respect no national boundaries, include: new infections resulting from changes or evolution of existing organisms, known infections spreading to new geographic areas or populations; previously unrecognized infections appearing in areas undergoing ecologic transformation; and old infections reemerging as a result of antimicrobial resistance in known agents or breakdowns in public health measures.")
MeSH (Communicable Diseases, Emerging x Infectious Diseases, Emerging)
Alltheweb search, Nov. 13, 2003 (new infectious diseases, re-emerging infectious diseases, reemerging infectious diseases)