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To assess the risk of Guillain-Barré syndrome (GBS) following administration of meningococcal serogroup C-CRM(197) conjugate vaccine, provincial immunization records were linked with hospital discharge records, and medical charts were reviewed. In the cohort of 1.9 million individuals (age, 2 months to 20 years), observed postvaccination frequencies of GBS were not higher than expected.
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Wals et al. (2008) studied this question.
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