To the Editor.

In the July 2008 Pediatrics Electronic Pages, 3 of us (Drs Daskalaki, Long, and Watson) published the results of our analysis of computerized records of diphtheria-tetanus-acellular pertussis (DTaP) immunization of infants, with reference to prediction of the likelihood of being able to have immunized these children against rotavirus. These data were derived from the ages at which infants in Philadelphia, Pennsylvania, received their vaccines. Because of a previous rotavirus vaccine having been associated with intussusception, the guidelines for administration of the current rotavirus vaccines (RotaTeq [Merck & Co Inc, Whitehouse Station, NJ] and Rotarix [GSK Biologicals, Rixensart, Belgium]) are more stringent than for any other vaccines. These restrictions aim to avoid the possibility that administration at ages greater than evaluated during the extensive trials of the 2 vaccines might lead to intussusception.

To date, there is no evidence that either of the current vaccines are...

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