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Preface MAN has toiled hard to keep his animals healthy and have their company since their domestication. With the passage of time and development of Veterinary Science, the aim was redefined to keep the animal in harmony and get production or pleasure from them. With this the diseases and their treatment came into existence, the domain of veterinary sciences, the concept of livestock health management has been evoling continuously. Animal health management was based on supematural theory as the cause of disease in prehistoric period. This view has now shifted to non-infectious or infectious factors as cause of disease. and the interaction of the host, the agent and the environment including management has come into limelight. With these changes our approach for keeping the livestock healthy has also changed. We should aim to maintain animals in good health to get optimum production and pleasure. Advances have been made in the field of animal diseases during the last two decades, not only in the diagnosis but aso in the management and control of diseases. With the advances made in the field of diagnostics, quick and reliable diagnosis of many diseases is possible and aetiology of most of the diseases has been confirmed. Disease economics has to be taken care of, as we have to look into the cost of treatment. The approach is for disease management which not only includes medicinal treatment but also other measures like nutritional, managemental and environmental factors. Because of the shifting interest and importance of various diseases of animals in our context, it is necessary to provide the information on the current stattus of animal diseases, their diagnosis and management. With the introduction of syllabus recommended by the Veterinary Council of India (VCI) in all the colleges of Veterinary Sciences, it is most important that all the students get uniform information. Keeping this in view, the present text book on Clinical Medicine has been broughtout. It includes all those diseases prevalent in the country as well as those diseases recorded in other countries and possibility to enter into our country in future. This book contains 18 chapters and Appendices containing facts and data for ready reference. We thank the Director, Indian Veterinary Research Institute; Dean, College of Veterinary and Animal Sciences, Gobind Ballabh Pant University of Agriculture and Technology, Pantnagar; and Dean, College of Veterinary Sciences, Haryana Agriculture University, Hisar for their encouragement and constant interest in the preparation of this book. Co-operation and support extended by Dr A.K. Nachania, Associate Professor, Department of Epidemiology and Preventive Medicine, Haryana Agriculture University, Hisar is gratefully acknowledged. Unwavering co-operation and persistent assistance provided by Dr Chinmay Joshi, Senior Research Associate, National Fellow Project, Indian Vterinary itesearch Institute, Ieainagar The constant Involvement of Dr (Mrs) Tej Verma, the then Assistant Director General (Education), Indian Council of Agricultural Research has encouraged the editors to complete this huge task in a record time. This deserves special thank of the editors The painstaking efforts put in by Sri Kundan Singh, Cfficer in charge, Communicaltion Centre, Indian Veterinary Research Institute, Izatnagar and Mrs E. Negl, Editor, Engalish, Communication Centre, Indian Veterinary Research Insititute, Izainagar le highily apprectated We are highly indebted to the Indian Council of Agricultural Research, New Delhi, for the assistance and guidance. We thank Dr K.C. Kalyal, the then Deputy Director Gemeral (Education) and Dr K.M. Bajurbaurah, Deputy Director General (Animal Sciences) of the Indian Council of Agricultural Research for the encouragement and keen interest Our sincere thanks are to all the contributing authors as without their support, it could have not been possible to bring this book.