Why do we say "pandemia DA coronavirus" and not "pandemia DI coronavirus"?
PS: I have read extensively about the two prepositions and no case of what I have come across explains the usage of DA in this sentence.
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We can't say pandemia di coronavirus, because pandemia can have as a specification the name of a disease. The name of the disease is covid-19, so we can say either
pandemia di covid-19
pandemia da coronavirus
The virus is the cause of the pandemic, not the effect, hence da. Similarly, it's epidemia di influenza, di vaiolo, di Ebola. We can't say epidemia da influenza. It could be epidemia da Ebola if we think to Ebola as the name of the virus.