Children with inborn errors of metabolism received vaccines on the same immunization schedule as did healthy infants, according to Kaiser Permanente Vaccine Study Center scientists who examined the Kaiser Permanente Northern California population. In addition, immunization was not associated with significant increases in emergency room visits or hospitalizations during the month following vaccination, according to Nicola Klein, MD, PhD, lead author of the study and co-director of the Kaiser Permanente Vaccine Study Center.
The study appears in the current online issue of Pediatrics.
The paper is among the first to study immunization rates and vaccine safety in children with inherited metabolic disorders, which is a potential high-risk population for vaccine-preventable illnesses. Inborn errors of metabolism comprise a large class of genetic diseases characterized by defects in enzymes required for breaking down organic compounds, said the researchers. Although each condition is individually rare, it is estimated that the collective birth prevalence is between 1 in 2,500 to 5,000 live births, they explained.
Studying infants with inborn metabolism errors compared with matched healthy controls, similar proportions of children in the Kaiser Permanente Northern California population were up to date for vaccines at 2 years of age, and there was no evidence of delay in receipt of recommended vaccines during the first year, said Klein. Importantly, vaccination of children with inborn errors of metabolism was not associated with significant increases in emergency room visits or hospitalizations during the 30 days after vaccination.
"It's important to note that children with inherited metabolic disorders are particularly vulnerable to metabolic stress, including fever that results from infections and inflammatory processes, as well as vaccine-preventable diseases," Klein said. "This study adds important information to the ev
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