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More than half the residents tested in Italy’s northern province of Bergamo have COVID-19 antibodies, health authorities said on Monday, citing a sample survey.

Of 9,965 residents who had blood tests between April 23 and June 3, 57% had antibodies indicating they had come into contact with the coronavirus, the survey showed, according to Reuters.

Health authorities in Bergamo said the results were based on a “random” sample which was “sufficiently broad” to be a reliable indicator of how many people had been infected in the province, which became the epicentre of Italy’s outbreak.

In a separate statement issued later, the Bergamo health agency said that most of those in the sample were residents of the worst-hit areas. Many had already been put under quarantine, the statement added.

Antibodies were found in just over 30% of the 10,404 health operators tested although they are generally considered more at risk than other people.

In a report released in early May, national statistics institute ISTAT said the number of deaths in Bergamo was up 568% in March compared with the 2015-2019 average, making it Italy’s worst-hit city in terms of deaths.

Its hospitals were overwhelmed by infected people and, with morgues unable to keep up, convoys of army trucks carrying away the dead became a chilling symbol of the global pandemic.

Bergamo province has reported 13,609 coronavirus cases, official data showed on Monday.