Global Trends in Emerging Infectious Diseases

Emerging infections are unpredictable. EID rarely stands out as unusual, and the continuous pressure on health care budgets forces clinicians and laboratories to prioritize their diagnostic work-up to common and treatable conditions. Emerging infections can be caused by 

•  Previously undetected or unknown infectious agents

•  Known agents that have spread to new geographic locations or new populations

•  Previously known agents whose role in specific diseases has previously gone unrecognized.

•  Re-emergence of agents whose incidence of disease had significantly declined in the past, but whose incidence of disease has reappeared. This class of diseases is known as re-emerging infectious diseases