Before revision:  It greatly reduces the number of tests , however, with a sacrifice of increasing false negative rates due to the dilution of the viral load in pooled samples. Therefore, it is important to balance the trade-off between number of tests and false negative rate.
After revision:  It greatly reduces the number of tests , however, do not consider dilution effects: that false negatives become more common with larger pools. As a consequence, they may recommend pool sizes that are too large or misestimate the benefits of screening. Modeling dilution effects, we derive closed-form expressions for the expected number of tests and false negative rate.