Effectiveness Of Pcr Pool Testing For Screening Of Covid-19 Infection In Pakistan.

Background: We tested the utility of mini-pool PCR testing for the rational use of PCR consumables in screening for CoViD-19.

Methods: After pilot experiments, 3-samples pool size was selected. One step RT-PCR was performed. The samples in the mini-pool having COVID gene amplification were tested individually.

Results: 1548 samples tested in 516 mini-pools resulted 396 mini-pools as negative and 120 as positive. Upon individual testing, 110 samples tested positive and 9 were inconclusive. 876 PCR reactions were performed to test 1548 samples, saving 43% PCR reagents. Centres with low prevalence resulted in most saving on reagents (50%), while centres with high prevalence resulted in more test reactions. Testing of individual samples resulted in delays in reporting.

Conclusions: Pooling can increase lab capacity, however, pooling delays results and cause degradation of samples.