By virtually every yardstick, antisemitism in the US and Europe is rising and worsening in ways not seen since the 1930s. It comes in the forms of vandalism, social media abuse, assault and murder. Like a virus, it mutates and evolves across cultures, borders and ideologies, making it all but impossible to stop. Filmmaker Andrew Goldberg explores its infectious behavior in his film Viral: Antisemitism in Four Mutations as he travels through four countries to speak firsthand with victims, witnesses, antisemites, and interviewees including Bill Clinton, Tony Blair, Fareed Zakaria, George Will and Deborah Lipstadt. The film examines how some on the American far right have incited such acts as the mass shooting at the Tree of Life Synagogue in Pittsburgh, PA. In Hungary, we see how the Prime Minister has launched a massive campaign against Jewish Holocaust survivor and billionaire George Soros that's reminiscent of Nazi propaganda. Moving to the far left in England, we see members of the traditionally anti-racist Labour party conflating Israel and Jews, causing tremendous pain for the Jewish community. And in France, the film illuminates the seemingly endless wave of violence against Jews by Islamists and radicals.