Additional file 1.

Sensitivity and positive predictive value (PPV) of individual ICD9 codes for identification of validated local reactions and validated events possibly indicative of a hypersensitivity response to Td vaccination. The data provided report the proportion of validated events that were associated with specific ICD9 codes.

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Jackson et al. BMC Infectious Diseases 2009 9:165   doi:10.1186/1471-2334-9-165