The world Health Organization has estimated "very interesting," the findings of the study on the wastewater, which has concluded that the presence of the SARS-Cov-2 as early as December in Italy. But she said Monday in Geneva that it did "not change for the moment the hypothesis of the origin of the virus" in China.

other studies had been previously conducted on the wastewater in other countries. They are all "very important", said the press the head of the emergency programme within the world Health Organization (WHO), Michael Ryan.