Vaccine against rotavirus has led to dramatic drop in hospitalizations:

The AP (10/26, Marchione) reported that Centers for Disease Control and Prevention (CDC) found that a "vaccine against rotavirus, the leading cause of diarrhea in infants, has led to a dramatic drop in hospitalization and emergency room visits since it came on the market two years ago." In fact, Merck & Co.'s Rotateq "seems to be preventing illness even in unvaccinated children by cutting the number of infections in the community that kids can pick up and spread." Before the vaccine was introduced in 2006, "more than 200,000 U.S. children were taken to emergency rooms, and more than 55,000 were hospitalized each year with rotavirus." Now, "hospital visits and stays due to the virus have dropped 80 percent to 100 percent, studies by the CDC and several other groups show."