Zombie Viruses: Fascinating and a Little Frightening

See the full article on WebMD, written by Caitlin Taylor.

“There is a small risk that a frozen virus that gets unearthed is able to start an infection chain that ends up in humans,” says Adrian Liston, PhD. “On the one hand, we would not have pre-existing immunity against it, so the initial ability to combat the infection is low. On the other hand, the virus would not be adapted to infect (modern-day) humans, so the chance of an initial infection being successful for the virus is extremely low.”

“‘Entry events’ do happen, very rarely, and they can shape human evolution,” says Liston. “Major examples would be smallpox (a virus) and tuberculosis (a bacteria), which strongly influenced human evolution when they entered our species, selecting for the type of immune system that was able to fight them and killing off individuals with the ‘wrong’ type of immune system.”

“The most important take-home message is that climate change is going to create unexpected problems,” says Liston. “It isn’t simply changes to weather, climate events, and sea levels rising. A whole cascade of secondary problems will be generated. New infections, some of which could go pandemic, are almost certainly going to happen because of climate change.”