Analysis of the January 25, 1999 Performance Evaluation HIV-1 Antibody Testing Results Reported to the Centers for Disease Control and Prevention (CDC) by Laboratories Participating in the Model Performance Evaluation Program

This report is an analysis of results provided to the Centers for Disease Control and Prevention (CDC) by laboratories participating in the Model Performance Evaluation Program (MPEP) after they tested the human immunodeficiency virus type 1 (HIV-1) performance evaluation samples shipped to them January 25, 1999. Testing results were reported by 804 (90.2%) of 891 laboratories that were sent sample panels. One laboratory returned results but failed to identify the sample codes for the samples they tested; consequently, test results from this laboratory are not included in the analysis. Additionally, 4 laboratories returned results more than 4 weeks after the cutoff date and these results are not included in the analysis.