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Analysis reveals malaria, other diseases as ancient, adaptive and persistent foes
Date:11/2/2011

y as 1935 there were 900,000 cases of malaria in the United States," he said. "Near Portland, Ore., malaria almost wiped out some local Indian tribes in the 1830s, and the mosquitoes that carried it are still prevalent there. In the 1600s it hindered colonization from Massachusetts to Georgia. And there are 137 million people right now living in areas of risk in the Americas.

"It's possible epidemics could explode again, almost anywhere in the world," he said.

Having traveled much of the world to pursue amber, Poinar knows first-hand the risks involved.

"I caught malaria in the 1970s in the Ivory Coast in Africa," he said. "My arm had bumped up against some mosquito netting while I slept. The following day, I started shaking with cold, then sweating with a high fever, thinking I was going to die."

Millions have died. Globally, about 300-500 million cases of malaria occur each year, with more than a million deaths in Africa alone.

Among the points made in this report:

  • Discoveries in amber have helped to pin down the minimum ages, origins and early hosts of several insect-borne human diseases.

  • An archaic and now extinct malarial parasite was found in 100 million-year-old amber.

  • Mosquitoes carrying malaria of the genus Plasmodium, the type that causes human illness, were established in the New World at least 15 million years ago, long before modern humans existed. At that time, the disease infected various types of birds.

  • Spaniards arriving in South America found that when native peoples acquired fevers, they drank infusions of cinchona bark, which was later found to contain quinine, an effective anti-malarial drug.

  • Malaria apparently first went from birds to monkeys and eventually into humans.

Anatomically modern humans are only about 200,000 years old, experts say. These findings indicate they evolved with malaria for their entire existen
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Contact: George Poinar, Jr.
poinarg@science.oregonstate.edu
541-737-5366
Oregon State University
Source:Eurekalert

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