Research overview: vaccine-induced distemper disease risk in nondomestic felids

Modified-live canine distemper vaccines, while protective in dogs, have caused vaccine-induced disease when given to some nondomestic carnivores, complicating efforts to protect wild felids. This overview surveys the history of vaccine-induced distemper in exotic species, the resulting caution around live vaccines in big cats, and the shift toward safer recombinant alternatives. It examines the immunological basis for differential vaccine safety across species, the trade-offs between safety and efficacy, and the implications for any field vaccination of endangered cats. The synthesis connects vaccinology to the practical challenges of disease prevention in wildlife. It aims to help readers understand why vaccinating wild felids against distemper is not a simple transfer of dog protocols, and why the very tool meant to prevent disease must be chosen carefully to avoid causing it.