A soccer game in Milan may have been a major factor in turning Lombardy into coronavirus epicenter

Experts are now convinced a February Champions League soccer game between the Italian club Atalanta and the Spanish club Valencia was at the forefront of an explosion of COVID-19 cases in Italy's Lombardy region, the epicenter of the coronavirus outbreak in Europe, The Wall Street Journal reports.

More than 40,000 people crammed into San Siro stadium in Milan to watch the contest, a 4-1 victory for Atalanta. Then, two weeks later Bergamo, where Atalanta is based, experienced a major spike in cases, with scientists pinpointing the match as a crucial petri dish. "Two weeks after Feb. 19, there was an incredible explosion of cases," said Dr. Francesco Le Foche, an immunologist in charge of infectious diseases at Policlinico Umberto I in Rome. "The match played a huge role in disseminating coronavirus throughout Lombardy and in Bergamo in particular."

To put it in perspective, 35 percent of Valencia's traveling squad tested positive for the virus after the team returned to Spain. Only one Atalanta player tested positive, but the club has published death notices on its website for five people linked to the virus who were close to the club within the last two weeks, all of whom were present for Atalanta's victory over Valencia.

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The match shows the type of role sporting events can play in furthering the spread of the virus, further explaining why nearly every professional league has shut down operations, and casting doubt on whether some sports will come back at all this year. Read more at The Wall Street Journal.