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An earlier, population-based study in children aged 6 to 23 months showed that the risk for sickle cell crises was slightly but nonsignificantly increased during the 14 days following receipt of trivalent influenza vaccine (TIV) compared with a prevaccination control period (JAMA 2006; 296:1990). Now, the same research group has conducted a large cohort study, again using records from the eight managed-care institutions involved in the CDC's Vaccine Safety Datalink (VSD) project. During each of the study years, the VSD cohort included about 2.2 million children aged <18 years.
The present study involved all children aged 6 months to 17 years who were in the VSD cohort between 1999 and 2006 and had a diagnosis of sickle cell disease (SCD). Ch…