Abstract
The ancient technique of variolation (inoculation of the smallpox) which was introduced in the United States in 1721 was replaced by vaccination (inoculation of the cowpox) soon after the procedure was published by Edward Jenner in 1798. Benjamin Waterhouse is recognized as the introducer of smallpox vaccination in the United States having conducted the first vaccination in Boston on 8 July 1800, although other American physicians also played an important role in extending vaccination in the East Coast of the United States. A different route of introduction brought the smallpox vaccine from Mexico to New Mexico (March 1805) and Texas (April 1806) which at that time where part of the Viceroyalty of New Spain. The vaccine was brought to California in 1817 by Russian merchants who obtained it in Peru, where the vaccine had arrived in 1806 with the Spanish Philanthropic Expedition of the Vaccine. It took almost 150 years of vaccination efforts before the last natural outbreak of smallpox occurred in the United States in 1949.
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