Which countries cannot import syphilis?

The purpose of Canadian government's opening immigration is to maintain multiculturalism and promote social and economic growth. It is unfair to other taxpayers if the arrival of immigrants takes up too much contribution from other taxpayers.

Syphilis is a chronic systemic sexually transmitted disease caused by Treponema pallidum. If not treated in time, it may cause diseases of nervous system, cardiovascular system and skeletal system, and even endanger life.