BERLIN — Jewish life around the world is under attack once again by ‘‘classic traditional antisemitism,’’ according to a report by an Israeli university released Wednesday.

While acts of violent anti-Semitism dropped 9 percent from 2016 to 2017, other incidents such as abuse and harassment are on the rise and have led to a ‘‘certain corrosion of Jewish life.’’

The study blames the surge on ‘‘the constant rise of the extreme right, a heated anti-Zionist discourse in the left, accompanied by harsh antisemitic expressions, and radical Islamism.’’

In its latest assessment. Kantor Center for the Study of Contemporary European Jewry at Tel Aviv University says ‘‘Europe’s largest Jewish communities are experiencing a normalization and mainstreaming of antisemitism not seen since the Second World War.’’

‘‘There has been an increase in open, unashamed, and explicit hatred directed against Jews. The Jew as exploiter, the Jew as killer, the Jew as banker. It is like we have regressed 100 years,’’ the president of the European Jewish Congress, Moshe Kantor, was quoted as saying in a statement.

In recent weeks, thousands marched in London against what they perceive to be blatant anti-Semitism in Britain’s mainstream Labour Party. In France, the Paris prosecutor’s office is investigating whether anti-Semitism was a motivation for the killing of an 85-year-old Holocaust survivor. There has also been a string of anti-Semitic incidents in German schools in recent weeks. And in Poland, a renowned anti-racism activist was recently branded a traitor after speaking out against a controversial anti-defamation law concerning Holocaust complicity.

‘‘The result is of a Jewish community in many places around the world living in fear,’’ Kantor was quoted as saying in a statement.