人痘接种在美国随着殖民主义的扩张，曾在欧州和亚洲游历过的天花，也踏上了美洲这片神秘的土地。由于土著美人也就是印第安人对此毫无免疫力，所以他们大批大批地死去。这种“印第安瘟疫”在１６世纪曾横扫中美和南美，长期以来它一直是印第安人人口减少的主要原因。面对... Vaccination of people in the United States With the expansion of colonialism in the United States, the smallpox that had traveled in Europe and Asia has also embarked on the mysterious land of the Americas. Because indigenous Americans, or Indians, were immune to it, they died in large numbers in large numbers. This “Indian plague” swept through China, the United States and South America in the sixteenth century and has long been a major cause of the decline in the Indian population. face...