NL: COVID-19 Sewage research
https://www.kwrwater.nl/en/actueel/update-covid-19-sewage-research/
In the case of sewage, one test is sufficient to determine whether an entire population is infected with the coronavirus.
The advantage of this method is that it is very specific and sensitive.
We test whether the virus is circulating in a city or municipality, not who is or who is not infected within that population.
The significance of sewage research is that if it is done regularly over a long period
(we have a weekly frequency in mind, in a large and representative number, for instance, in a hotspot or even where no corona patients have been reported),
we can determine whether the coronavirus is slowly disappearing in the population (‘flattening of the curve’)
and whether – presumably in the winter – it is returning.
In early February, we noted that the sewage flashed ‘red’ before patients above-ground showed any signs of the coronavirus.