"As the worms migrate through the body, they can cause a cough and an unpleasant feeling as the worm is swallowed," Mitchell said. He said the king's doctors wouldn't have linked those symptoms to the worms and probably would have prescribed treatments including bloodletting. Mitchell doubted the worms would have worsened Richard III's spinal deformity; William Shakespeare's play depicts him as a hunchback regent who had his two young nephews murdered so he could claim the English throne.
It's also possible Richard's worms made a gruesome appearance when he died on the battlefield in 1485 as the last English king killed in war. In adults infected with roundworm, traumatic events like car crashes can cause the worms to pop out of peoples' noses and ears.
"The worms get shocked and they move quickly," said Simon Brooker, a professor of epidemiology at the London School of Hygiene and Tropical Medicine, who was not part of the study. He said it was possible the many blade injuries suffered by Richard before his death could have prompted the worms in his body to make a hasty exit.
Brooker said there are about 820 million people worldwide who are infected with roundworm, who could be cured with a cheap, one-dose pill.
"Worms are a remaining problem today, as they once were even for nobility," Brooker said. "In an ideal world, in the absence of improved sanitation, we would like everyone infected to have as low infection levels as Richard III."
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