The increase is not yet a cause for concern, a spokesperson for the RIVM says. “It is still questionable whether the increase will continue,” he says. It is possible that the peak has already passed. Because the number of corona particles in the sewage is indeed increasing, but there are fewer people with a positive corona test. “There is indeed an increase in the number of virus particles, but it is actually not very high.” That is why no alarm bells are ringing at the RIVM for the time being.