The completeness, validity, and timeliness of AIDS surveillance data

Area of Science:

• Public Health Surveillance
• Epidemiology
• Infectious Disease Monitoring

Background:

• The 1993 revision of the Acquired Immunodeficiency Syndrome (AIDS) case definition aimed to improve case ascertainment.
• Evaluating the impact of such changes on surveillance system performance is crucial for public health.
• Understanding surveillance system dynamics is key to effective HIV/AIDS program implementation.

Purpose of the Study:

• To evaluate the completeness, validity, and timeliness of the AIDS surveillance system post-1993 case definition change.
• To provide data on the performance of AIDS surveillance systems after a significant policy update.

Main Methods:

• Completeness was assessed by comparing surveillance registries with independent data sources.
• Validity was evaluated by reviewing medical records for agreement on demographic and risk factors.
• Timeliness was measured by calculating the median delay between diagnosis and case reporting before and after the definition change.

Main Results:

• AIDS case reporting demonstrated high completeness in both hospital (>=93%) and outpatient (>=90%) settings.
• High agreement (>98%) was observed for sex, with substantial agreement for race/ethnicity (>83%) and risk groups (>67%).
• The median reporting delay was four months, with site-specific variations (3-6 months).

Conclusions:

• The AIDS surveillance system maintained high levels of completeness, validity, and timeliness after the 1993 case definition revision.
• These findings support the continued effectiveness of the surveillance system.
• The study offers insights for integrated HIV and AIDS surveillance program development.