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A study has detected remains of coronavirus in Italian wastewater as early as December 2019, two months before the health alert was decreed, according to a study published by the Italian Higher Institute of Health that Afp has advanced. Wastewater from the metropolitan area has found traces of Covid-19 , in 14 of the 40 samples collected from December to February in many Italian cities, such as Turin , Milan or Bologna .

The study examined 40 samples of wastewater collected between October 2019 and February 2020, and 24 control samples for which the sampling date (September 2018 - June 2019) allowed to safely exclude the presence of the virus. The results, confirmed in two different laboratories with two different methods, showed the presence of coronavirus in the samples taken in Milan and Turin on December 18 and in Bologna on January 29. In the same cities, positive samples were also found in the following months of January and February 2020, while the samples from October and November 2019, as well as all the control samples, gave negative results.

The first date of the Piedmontese capital is December 18. The data, although limited the presence of the virus found in the waters of the Turin area, are essential to understand when the coronavirus really began to circulate in the city. Long before, apparently, the first cases that set off alarms.

In Spain, an analysis of the University of Barcelona , in collaboration with Aguas de Barcelona , already found the presence of coronaviruses in Barcelona's wastewater on January 15, 41 days before the first case was detected.

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