The study of wastewater could act as an early indicator of coronavirus infections, even before people are diagnosed.
Infection rates in France had appeared to be slowing.
But he said it could be used in conjunction with other data to detect early warning signs of the virus spreading, even before people become sick enough to seek medical help. "What are we seeing since the end of June? We've seen some locations that were negative [for virus traces] and are becoming positive," he said.
These are then taken to the laboratory, where they are analysed by researchers in biohazard suits and masks.
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