Those few are Amerindians. American Renaissance News: Swine Flu: Is There a Racial Link? Although there is no information on the ethnic mix of the fatal cases, it may be that this disease is particularly dangerous for Amerindians. The original inhabitants of the Americas crossed the land bridge from Asia before animals were domesticated, so they were never exposed to the animal-born diseases that later ravaged Europe and Asia. Aside from llamas and related species, Indians had few domesticated animals of their own and did not evolve strong immune systems. They were overwhelmed by the Old World diseases the Spaniards brought to America, and it may be that today’s Latin Americans are still more vulnerable to diseases that originated in animals.