Adenovirus is one of the enteric viruses spreading in Egypt. Results in Figure 1 and Table 2 showed that 66% of samples were positive. Although this is a high prevalence, comparing it to pre-corona pandemic reports, it is lower than the recorded prevalence in the same WWTP in 2017 in untreated and treated wastewater which was 84 and 50%, respectively (Elmahdy et al. 2019). Another study also concerned with the same WWTP showed 91.7% positivity of adenovirus (El-Senousy et al. 2013). On the contrary, another study reporting on a different WWTP called Abou-Rawash showed the presence of adenovirus in 50% of wastewater samples (Elmahdy et al. 2020).