That is what was done. > The arthritis incidence in the patients receiving Lyme vaccine occurred at the same rate as the background in unvaccinated individuals

That is what was done. > The arthritis incidence in the patients receiving Lyme vaccine occurred at the same rate as the background in unvaccinated individuals. In addition, the data did not show a temporal spike in arthritis diagnoses after the second and third vaccine dose expected for an immune-mediated phenomenon. The FDA found no suggestion that the Lyme vaccine caused harm to its recipients. [0] [0]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2870557/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2870557/