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Most Lyme vaccines have little or no side effects. If there are side effects, they pale in comparison to the effects of the disease.
Let me know if you still have questions.
There is a great debate about how well they actually work as well as potential side effects. There are publications concerning its safety, but the researchers only look 24 hours after the vaccine reaction. Research at Cornell University veterinary school brings up some suspicion that there may be potential long term side effects of the vaccine, though nothing is certain. These side effects may vary from rheumatoid arthritis and all the major symptoms of lyme disease to acute kidney failure.
These cases are very rare and there is little documentation.
I also want to add that Merial vaccines have been shown to have NO side effects.