Source google image: https://www.researchgate.net/profile/Lester_Shulman/publication/6179326/figure/tbl1/AS:667186217619456@1536080998038/Comparison-of-poliovirus-identification-from-processed-sewage-after-plaque-isolation-on_Q320.jpg
Plaque isolation 5+1
Source google image: https://www.researchgate.net/profile/Lester_Shulman/publication/6179326/figure/tbl1/AS:667186217619456@1536080998038/Comparison-of-poliovirus-identification-from-processed-sewage-after-plaque-isolation-on_Q320.jpg