Emerging and Re-Emerging Infectious Diseases

Emerging diseases are those whose incidence in humans has increased in the past two decades, and re-emergence is the reappearance of a known disease after a significant decline in incidence.4 The magnitude of the problem is illustrated by the appearance of several new pathogens causing disease of marked severity, such as the human immunodeficiency virus (HIV) and other retroviruses, arenaviruses, Hantaviruses and the Ebola virus. Old pathogens such as cholera, plague, dengue hemorrhagic fever and yellow fever have re-emerged and are having considerable impact in the Americas.
Re-emerging, or resurging, diseases are those that have been around for decades or centuries, but have come back in a different form or a different location. Examples are West Nile virus in the Western hemisphere, monkeypox in the United States, and dengue rebounding in Brazil and other parts of South America and working its way into the Caribbean.
  • Malaria and Tuberculosis
  • Influenza
  • SARS
  • Ebola
  • Nipah
  • West Nile Virus
  • Monkey pox