A side note on that article alone: while there were many reactions to lepto vaccines back "in the day", the vaccines we have now are MUCH MUCH more safer and I've only seen maybe 1 puppy in the past 2+ years come in for a vaccine reaction at my clinic.
On the topic of titers vs vaccines, I think it is important for you to discuss this concern with your vet. Many are more than happy to run the titers for you in lieu of vaccination. But I do stress the importance of discussing it with your vet, because some areas have a higher risk of contracting certain diseases (ie lymes, lepto, etc) and you may not want to cut those particular vaccines out of your yearly protocol if your pet is at a high risk for them.
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