Yersinia pestis bacteria rats fleas. Smallpox virus is one of the world s deadliest viruses that had killed more humans than any other virus in human history.
Yersinia pestis bacteria rats fleas.
Virus history in world. Today smallpox is a disease that has been completely eradicated. The virus which originated in russia or asia was the first to be rapidly spread by people on trains and steamships. The first known cases of ebola occurred in sudan and the democratic republic of congo in 1976 and the virus may have originated in bats.
Yersinia pestis bacteria rats fleas. In 20th century alone the virus killed about 200 500 million people worldwide. Smallpox virus is one of the world s deadliest viruses that had killed more humans than any other virus in human history.
The virus was evident in history from 10 000 bc. Dengue virus first appeared in the 1950s in the philippines and thailand and has since spread throughout the tropical and subtropical regions of the globe. In late december 2019 the world was introduced to a novel coronavirus sars cov 2 a pathogen that causes covid 19.
The virus was evident in history from 10 000 bc. Up to 40 of the world s population now. Just over two months later the world health organization who declared the.
12m china and india yellow fever. Human immunodeficiency virus hiv first emerged in the democratic republic of the congo in the late 1970s. The accepted hypothesis is that the virus jumped from chimps to humans through bush.
A new strain of the virus emerged in 1918 and the subsequent pandemic of spanish flu was one of the worst natural disasters in history. In the 20th century alone the virus killed about 200 500 million people worldwide. Great plague of london.
Today smallpox is a disease that has been completely eradicated.
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