smallpox vaccine

The year was 1947 – the last smallpox invasion in America. Ground zero:  New York City. The carrier: an ex-pat named Eugene LeBar, who had arrived from Mexico on March 1. By the time his diagnosis was confirmed, more than a month later, he had likely exposed thousands of New Yorkers. Even before arriving in New York, LeBar had traveled through seven major American population centers, exposing probably hundreds more.