When he arrived in Israel on 15 February, Mr Du had immediately to self-isolate for two weeks because of coronavirus restrictions.
In an interview with Israeli newspaper Makor Rishon last month, Mr Du said China was being made the world's scapegoat.
"In history, more than once, a certain group of people was accused of spreading pandemics," he said.
"That is despicable and should be condemned. The disease is an enemy of the entire humankind and the world should fight it together."
On Friday, his embassy made a scathing attack on US Secretary of State Mike Pompeo who had criticised China's handling of the coronavirus pandemic on a visit to Israel.
In a response published in the Jerusalem Post, the embassy condemned Mr Pompeo's "absurd comments", denying that China had ever covered up the crisis.
Baka nalaman nang Mossad na virus spreader is Mr. Du, you know Israeli intelligence ain't a joke. Or maybe his death is connected to a much bigger world war three type of conspiracy.
insert tinfoil hat