Clinicians and epidemiologists warn the decision could unravel decades of progress and expose newborns to a deadly, preventable disease.
When Dr. Su Wang was in medical school, she donated blood. That's when she learned she was infected with hepatitis B, a virus that attacks the liver and can lead to cancer and death decades later.
"I was 18, healthy, in college," she said. "And sudde... [11164 chars]