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Rotavirus Vaccine a Success Story

New Vaccine Dramatically Cuts Severe Cases of Diarrheal Illness in U.S. Children

Rotavirus' Grim Toll continued...

"In the three years before the vaccine became available, more than one out of every four tests submitted was positive for rotavirus. This season fewer than one in 12 were," says Quest's Jay Lieberman, MD.

Of note was that the rate of positive tests fell in every age group, including those aged 2 to 6 years, he says.

"Because children older than 2 years are unlikely to have been vaccinated, these data suggest a herd immunity phenomenon. [This] occurs when enough children get vaccinated so that transmission of the virus is interrupted in the community and even unvaccinated children are unlikely to get disease," Lieberman tells WebMD.

  • A CDC study showed that the number of confirmed cases of rotavirus plummeted more than 80% in the 2007-2008 season, compared with the previous two years.
  • At the University of Massachusetts Medical School in Worcester, there was a "dramatic decrease" in rotavirus cases, from 65 cases per year before RotaTeq came on the market to 37 cases in 2007, according to researcher Steven Hatch, MD. This year, the figure fell to three, he tells WebMD.
  • Researchers at Children's Mercy Hospital in Kansas City, Mo., report that only 62 children were admitted for rotavirus infections in 2008, compared with more than 300 annually the previous four years.
  • In North Philadelphia, rotavirus-associated hospitalizations among infants aged 6 to 11 months dropped 94% since rotavirus vaccinations began in 2006, says Irini Daskalaki, MD, of Drexel University College of Medicine.
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