To test whether possible contamination with the neuritogenic P2 protein from peripheral nerve myelin contributed to the increased incidence of Guillain-Barré syndrome during the national influenza immunization program, monovalent and bivalent vaccines from each manufacturer were tested using a recently developed radioimmunoassay for P2 protein. No P2 protein was found in any of the vaccines tested.
Brostoff SW, White TM. Absence of P2 Protein in Swine Flu Vaccines. JAMA. 1982;247(4):495. doi:10.1001/jama.1982.03320290041029
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