Stein traces their involvement, at least in South Africa, to the massivemigration of Jews from Eastern Europe, particularly Russia-controlled Lithuania.
It is thought the outbreak was directly linked to Sierra Leone's past conflict, which caused a massivemigration from rural to urban areas, resulting in overpopulation and poor sanitation.
It said it was urgently appealing, along with the International Organisation for Migration, for governments to engage in "a massive humanitarian evacuation of tens of thousands of Egyptians and other third country nationals".