<http://schema.org/about>
"An Australian study found that whooping cough cases caused by a new strain have increased from 31 percent to 84 percent in the last 10 years."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/whooping-cough-strain-has-potential-to-be-epidemic>