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The National Notifiable Diseases Surveillance System tracks 52 infectious diseases in the U.S. Of these, the ten most frequently reported diseases in 1995 were (in descending order): chlamydia, gonorrhea, AIDS, salmonellosis, hepatitis A, shigellosis, tuberculosis, primary and secondary syphilis, Lyme disease, and hepatitis B. Sexually transmitted diseases (chlamydia, gonorrhea, AIDS, syphilis, and hepatitis B) accounted for 87 percent of all cases for these ten diseases.
The frequency profile varied dramatically with age. Salmonellosis and shigellosis were most common for children under 5, whereas gonorrhea and shigellosis were dominant among 5- to 14-year-olds. Gonorrhea remained most common among those aged 15 to 24, and AIDS and gonorrhe…