From the Guardian
Italy: Covid-19 was present in two big cities two months before first case was detected
The
coronavirus was present in two large Italian cities in December, more than two months before the first case was detected, a national health institute study of waste water has found.
That suggests the virus appeared in
Italy around the same time it was first reported in
China.
Researchers discovered genetic traces of Sars-CoV-2 - as the virus is officially known - in samples of waste water collected in Milan and Turin at the end of last year, and Bologna in January, the ISS institute said in a statement seen by AFP on Friday.
Italy’s first known native case was discovered mid-February.
The results “help to understand the start of the circulation of the virus in
Italy,” the ISS said.
They also “confirm the by-now consolidated international evidence” as to the strategic function of sewer samples as an early detection tool, it added.
The results feed into an effort by scientists around the world to trace the virus’s family tree