Zoonotic diseases (infections transmitted between animals and humans) account for approximately 60% of all known human infectious diseases and 75% of emerging infectious diseases globally. In India, with its vast livestock population and close human-animal interface, the role of the veterinarian as a first-line defender against zoonoses is indispensable and irreplaceable. What Are Zoonotic Diseases? A zoonosis is any disease or infection that is naturally transmissible from vertebrate animals to humans. Transmission may occur through direct contact with infected animals, ingestion of contaminated animal products, arthropod vectors (ticks, mosquitoes, fleas), or through environmental contamination of soil and water. In India, the convergence of high livestock density, diverse wildlife habitats, and dense human populations creates conditions highly favourable for zoonotic spillover events. Diseases such as Rabies, Brucellosis, Anthrax, Leptospirosis, Avian Influenza, Bovine Tuberculosis, and Q Fever continue to pose significant burdens on both animal and human health. Key Statistics — India's Animal-Human Interface India holds the world's largest bovine population (~304 million) - a significant reservoir interface for bovine TB and Brucellosis. About 18,000 - 20,000 human deaths are estimated annually from Rabies in India, the highest globally. Leptospirosis is endemic in 12+ Indian states, with annual outbreaks closely linked to livestock management practices. The outbreaks of Avian Influenza (H5N1), Nipah, Zika virus etc underscore the need for rapid veterinary response networks. The Veterinarian as a Public Health Asset Veterinarians occupy a unique position at the human-animal-ecosystem interface. Unlike any other health professional, the veterinarian is trained to recognise disease in animals before it spills over to human populations. This early-warning capacity makes veterinary surveillance the most cost-effective layer of zoonotic disease prevention. The Department of Animal Husbandry and Dairying (DAHD), Government of India, recognises veterinary professionals as essential partners in the National One Health Mission, working alongside public health, wildlife and environmental agencies. Key Roles in Zoonotic Disease Prevention Surveillance and Early Detection - Field veterinarians conduct routine clinical examinations and post-mortem investigations that serve as sentinel surveillance for zoonotic pathogens. Prompt reporting of unusual morbidity or mortality events in livestock and poultry triggers the public health response chain and can prevent large-scale human outbreaks. Vaccination and Prophylaxis - Mass vaccination campaigns conducted by veterinarians directly protect human populations. Anti-Rabies vaccination of dogs and livestock under the National Rabies Control Programme, Brucellosis vaccination of cattle and buffalo under DAHD's control programmes, and Anthrax spore vaccination in endemic districts are all veterinary-led interventions with profound public health benefits. Food Safety at Source - Ante-mortem and post-mortem inspection of food-producing animals by veterinary officers ensures that zoonotic pathogens — including Salmonella, Campylobacter, Listeria, and Mycobacterium bovis — do not enter the food chain. The veterinarian's role in ensuring hygienic milk production, safe meat handling, and egg quality control directly reduces the foodborne zoonosis burden. Farmer and Community Education - Field veterinarians are often the only scientific professional with direct, repeated contact with farming communities. They are ideally placed to counsel farmers on personal protective practices (gloves during calving, safe carcass disposal, rodent control), zoonotic risk during occupational exposure, and the importance of reporting sick animals promptly. Antimicrobial Stewardship - Irrational antibiotic use in livestock amplifies antimicrobial resistance — a key driver of drug-resistant zoonotic infections in humans. Veterinarians, through rational prescription practices and farmer education, serve as critical gatekeepers in the antimicrobial resistance (AMR) response. Coordination with Human Health Authorities - During outbreak investigations, veterinary teams collect animal samples, map disease clusters, and liaise with district and state public health authorities. This cross-sectoral coordination is the operational backbone of the One Health approach in India. Notifiable Zoonoses - Veterinary Reporting Obligations in India Under the Prevention and Control of Infectious and Contagious Diseases in Animals Act, 2009, veterinarians are legally mandated to report the scheduled diseases to the nearest Veterninary Officer of the Animal Husbandry Department. Some of the common zoonoses listed in the Scheduled diseases are as follows. Disease Primary Animal Reservoir Rabies Dogs, livestock, wildlife Brucellosis Cattle, buffalo, goats Anthrax Cattle, buffalo, sheep Leptospirosis Cattle, dogs, rodents Avian Influenza Poultry, wild birds Bovine Tuberculosis Cattle, buffalo Glanders Horses, Donkeys and Mules For the complete list of Scheduled diseases, click here. One Health: Veterinarians at the Intersection The "One Health" concept — formally endorsed by the WHO, FAO, OIE (WOAH), and UNEP — recognises that human health, animal health, and ecosystem health are interconnected and must be addressed together. India's National One Health Mission, launched in 2021, operationalises this framework through joint surveillance networks, integrated laboratories, and cross-disciplinary outbreak response teams. Within this framework, veterinarians function as: Sentinels — detecting disease at the animal source before human exposure occurs Investigators — tracing the epidemiological chain linking animal infection to human cases Responders — implementing control measures in animal populations to break transmission Communicators — translating complex epidemiological data into actionable farmer and community guidance Challenges and the Way Forward Despite their critical role, field veterinarians in India face significant operational challenges: Vacancy crisis: Large numbers of sanctioned veterinary posts remain unfilled, especially in tribal, hilly, and remote districts. Infrastructure gaps: Many Veterinary Dispensaries and Polyclinics lack diagnostic equipment, cold chain storage, and reliable power supply. Surveillance underreporting: Fear of trade implications often discourages timely reporting of zoonotic disease events at the farm level. Intersectoral coordination: Effective One Health response requires integrated data systems between animal husbandry, human health, and wildlife departments — still nascent in most Indian states. Recommendations for Strengthening Veterinary Zoonosis Response Mandate zoonotic disease modules in BVSc & AH curricula with field-based practicals Integrate veterinary field data into IDSP (Integrated Disease Surveillance Programme) reporting Equip Veterinary Dispensaries with rapid diagnostic kits for priority zoonoses Promote adoption of digital clinical decision support tools to support evidence-based field practice Establish joint vet-physician outbreak response teams at district level