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An analysis using case reports, laboratory records of tests for C. trachomatis, and Hospital Discharge Summary data shows that, following implementation of a chlamydia prevention program in Wisconsin in 1985, statewide declines were observed in prevalence, incidence and complications of infection. In 1990, prevalence rates among teenage women peaked at 2,794 infections per 100,000 15-19-year-old females. Between 1987 and 1991 (a period of stable testing volume), the proportion of positive tests decreased in all age-groups for females (by 29-41%) and males (by 10-14%), and the incidence of new infections in women decreased in clinic populations by 27%-50%. Between 1986 and 1991, hospitalization rates declined by 33% for pelvic inflammatory disease and by 20% for ectopic pregnancy.

Mutation testing of a test suite and a program provides a way to measure the quality of the test suite. In essence, mutation testing is a form of sensitivity testing: by running mutated versions of the program against the test suite, mutation testing measures the suite's sensitivity for detecting bugs that a programmer might introduce into the program. This paper introduces a technique to improve mutation testing that we call wild-caught mutants; it provides a method for creating potential faults that are more closely coupled with changes made by actual programmers. This technique allows the mutation tester to have more certainty that the test suite is sensitive to the kind of changes that have been observed to have been made by programmers in real-world cases. CCS CONCEPTS • Software and its engineering → Software configuration management and version control systems; Software testing and debugging; Parsers;