Research overview: vaccination strategies and risks for protecting wild felids from distemper

Vaccinating endangered wild felids against canine distemper is fraught with trade-offs. This overview surveys the options: modified-live vaccines, which risk vaccine-induced disease in non-target species, versus safer but sometimes less protective recombinant canarypox-vectored vaccines. It reviews experience vaccinating captive big cats, debates over field vaccination of free-ranging tigers or lions, and the practical hurdles of delivering and boosting vaccines in wildlife. The synthesis also weighs the alternative of controlling distemper in the domestic reservoir rather than vaccinating wildlife directly. By laying out the immunological, logistical and ethical dimensions, the overview helps readers understand why distemper vaccination of wild cats remains contentious and why decisions hinge on population size, isolation and the feasibility of reaching enough animals safely.