Porcine reproductive and respiratory syndrome (PRRS) is an important viral disease of swine. A popular way to diagnose PRRS infection is by detection of PRRS antibodies using a comercial system (HERDCHECK PRRS ELISA-IDEXX Laboratory, Westbrook, ME). For each sample tested, the system measuers PRRS antibodies and compares the concentration of antibody in the sample with the concentration of antibody in a known positive sample. The system outputs this result as an S:P ratio (sample: positive). Ratios ≥0.40 (the “cut-off” point) are interpreted to mena the sample is PRRS positive. We have observed that animals originating from PRRS negative herds have S:P ratios very near 0.00. The objective of this report was to characterize the typical PRRS S:P ration distribution in negative case submissions at the South Dakota Animal Disease Research and Diagnostic Laboratory (SDADRDL). Key Words: Reproductive, Respiratory, Epidemiology.
Number of Pages
South Dakota State University
Copyright © 2001
Epperson, W.B., "The distribution of PRRS S:P Ratios in PRRS
Negative Case Submissions" (2002). South Dakota Swine Research Report, 2001. 23.