Maryland hospitals are promoting hand washing among other measures to prevent patient infections. Leah-Anne Thompson/iStockphoto.com hide caption

toggle caption Leah-Anne Thompson/iStockphoto.com

Not all young girls avoid dirt. Hannah Rose Akerley, 7, plays in a gigantic lake of mud at the annual Mud Day event in Westland, Mich., last July. Bill Pugliano/Getty Images hide caption

toggle caption Bill Pugliano/Getty Images

Microsoft founder Bill Gates, his wife Melinda French Gates and British Prime Minister David Cameron at the World Economic Forum on January 28, 2011, in Davos, Switzerland. Johannes Eisele/AFP/Getty Images hide caption

toggle caption Johannes Eisele/AFP/Getty Images

A student at Carlin Springs Elementary School receives a flu shot last January in Arlington, Va. Mandel Ngan/AFP/Getty Images hide caption

toggle caption Mandel Ngan/AFP/Getty Images

Antibiotics Defeat Ear Infections In Young Kids, Studies Find

  • Download
  • <iframe src="https://www.npr.org/player/embed/132869336/132882227" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

A study that measured antibodies and the disease history of more than  200 kids found that two doses of vaccine were 98 percent effective in  preventing chickenpox compared with 86 percent for a single dose. AP hide caption

toggle caption AP

To Beat Chickenpox, 2 Shots Of Vaccine Are Best

  • Download
  • <iframe src="https://www.npr.org/player/embed/132801420/132797708" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript
Jeff J. Mitchell/Getty Images

Study Linking Childhood Vaccine And Autism Was Fraudulent

  • Download
  • <iframe src="https://www.npr.org/player/embed/132703314/132714490" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript