Infectious Agent Estimated Explained for Students (Easy Guide)

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Original Question

‘Infectious Agent’ An estimated 300 million people died from smallpox in the 20th century alone Kills 1/3 of those it infects Known to have co-existed with humans for thousands of years As the world’s population grew, and travel increased, the virus had access to larger and larger populations The earliest physical evidence of smallpox is the pustular rash on the mummified body of Pharaoh Ramesses V of Egypt 1157 BC Traders carried the disease from Egypt to India during the 1st millennium BC – Swept into China in the 1st century AD and reached Japan in the 6th century – Returning crusaders provided a way for smallpox to spread through Europe in the 11th and 12th centuries – Spanish inadvertently owe much of their success in conquering the Aztecs and Incas in Mexico in the 16th century to smallpox – Virgin population – Native Indians had no immunity to the disease – A century later the North American Indians suffered a similar devastation – In the 18th century smallpox decimated the aborigines when it reached Australia, the last corner of the world to have escaped its ravages **Smallpox** ‘Variolation’ – Variolation was a process developed in the 10th century in China and India. – Taking pus from the pocks of someone suffering from smallpox and inoculating healthy people with it. – Usually a mild case of smallpox developed, giving lifelong immunity afterwards. – About 0.5-2 percent of people died after variolation, compared with 20-30 percent after natural smallpox. – A m

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