Globalization led to the spread of diseases, and not the other way round (as the question asks). Globalization led to the spread of European population to North and South America from the 16th century onwards. European people carried with them diseases like small pox and typhus which were earlier non-existent in the new world (North and South America) thereby spreading these diseases. In the other direction, Europeans brought back with them new products like tobacco from the new world. As Europeans and Asians started consuming such products, it led to spread of diseases like tuberculosis and lung cancer.