Perspectives. New disease sources, workforce woes bedevil public health.
D004196:Disease Outbreaks; D006801:Humans; D011635:Public Health Administration; D045169:Severe Acute Respiratory Syndrome / Q000453:epidemiology; D014481:United States / Q000453:epidemiology; D014901:West Nile Fever / Q000453:epidemiology; D014944:World Health Organization