The coronavirus circulated in Italy already at December and the proof is in the waste water. To support it a study being published by theHigher Institute of Health on waste water of Milan is turin, in which there were already traces of the SARS-CoV-2 virus in December 2019. A shocking discovery: the “patient 1” of Codogno from which by convention the epidemic starts in Italy, it is no longer such: before him, someone else (or many others?) had contracted the coronavirus resulting as asymptomatic or falling within the case history of those “abnormal pneumonia” that doctors identified as Covid only after the emergence of the pandemic in China and the first cases also found in Lombardy and Veneto. For the analysis of waste water, explains the ISS, samples taken in purifiers of urban centers in Northern Italy, used as a “ spy ” for the circulation of the virus in the population.