New International Health Regulations come into force.
D023482:Bioterrorism / Q000517:prevention & control*; D002771:Cholera / Q000453:epidemiology; D018563:Disease Notification / Q000331:legislation & jurisprudence / Q000592:standards*; D004196:Disease Outbreaks / Q000517:prevention & control*; D005060:Europe / Q000453:epidemiology; D006801:Humans; D010930:Plague / Q000453:epidemiology; D011159:Population Surveillance / Q000379:methods*; D014944:World Health Organization / Q000458:organization & administration*; D015004:Yellow Fever / Q000453:epidemiology