central intelligence agency: an independent agency of the United States government responsible for collecting and coordinating intelligence and counterintelligence activities abroad in the national interest; headed by the Director of Central Intelligence under the supervision of the President and National Security Council
united states intelligence agency: an intelligence service in the United States
prevalence: (epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population