A water quality scientist, conducts tests on a water sample at the Eau de Paris research and analysis laboratories in Ivry-sur-Seine, near Paris, France, July 22, 2020. Scientists study the Paris waste water to detect the concentration of COVID-19 traces as France remains vigilant against the spread of the coronavirus disease (COVID-19). Picture taken July 22, 2020. REUTERS/Benoit Tessier
NOISY-LE-GRAND, France (Reuters) - Samples of wastewater from the Paris sewage system have been showing traces of COVID-19 again since the end of June, having vanished when France imposed a lockdown, according to the head of the laboratory leading the research.
Infection rates in France are subsiding, but officials this week made the wearing of masks in enclosed public spaces compulsory after a series of localised flare-ups. To date COVID-19 has killed over 30,000 people in France.
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