The Equine Rabies Immunoglobulin (ERIG) segmentation by application distinguishes three primary demand drivers: Human post‑exposure prophylaxis (PEP), Veterinary PEP, and Research & development. Human PEP accounts for the largest share, reflecting the global emphasis on preventing rabies transmission after animal bites and the inclusion of ERIG in WHO‑endorsed treatment protocols; it drives roughly 70 % of total market revenue. Veterinary PEP, representing about 20 % of the market, serves livestock and companion animals in regions where canine rabies remains endemic, contributing a modest but growing revenue stream as animal health initiatives expand. The remaining 10 % originates from research activities, including clinical trials, antivenom development, and immunogenicity studies, which sustain niche manufacturing capacity and support innovation pipelines. Collectively, these application segments define the overall market size, with each segment’s proportional contribution informing strategic allocation of production, distribution, and regulatory resources.