Viking Age smallpox complicates story of viral evolution
Posted at Jul 24 03:13 PM
The evolution of the deadliest virus in human history — smallpox — is only partly understood. Like the novel coronavirus and many other disease-causing viruses, smallpox seems to have originated in animals, probably rodents, and spilled over to humans, probably thousands of years ago. In the 20th century alone it killed hundreds of millions of people.
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