<http://schema.org/alternativeHeadline>
"Researchers will test the vaccine's effectiveness by taking blood from vaccinated people, and checking to see if antibodies in their blood can neutralize the virus."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/bird-flu-vaccine-how-will-we-know-it-works>