Contents: Section-I: Basics About Avian: 1.Glossary of poultry terms. 2. Taxonomy of avian species. 3. Immunity and inflammation in birds. Section-II: Bacterial Diseases: 4. Avian salmonellosis. 5. Paratyphoid infections. 6. Arizonosis. 7. Avian mycoplasmosis. 8. Colibacillosis /Escherichia coli infections. 9. Fowl cholera. 10. Riemerella anatipestifer infection. 11. Erysipelas. 12. Yersinia Pseudotuberculosis (Pasteurella Pseudotuberculosis). 13. Campylobacter infections. 14. Spirochetosis. 15. Avian intestinal spirochetosis. 16. Clostridial infections. 17.Infectious coryza (fowl coryza). 18. Ornithobacterium rhinotracheale infection. 19. Bardetellosis (Turkey Coryza). 20. Mycobacteriosis. 21. Chlamydiosis. 22. Omphalitis (Navel ill, Mushy chick disease). 23. Staphylococcosis. 24. Streptococcus. 25. Enterococcosis. Section-III: Viral Diseases: 26. Newcastle disease (ND; Avian Pneumoencephalitis). 27. Pneumovirus infections (Turkey Rhinotracheitis, TRT and Swollen Head Syndrome, SHS). 28. Infectious laryngotracheitis (Laryngotracheitis, ILT; LT). 29. Infectious bronchitis (IB). 30. Infectious anemia (Chicken Anemia Agent [CAA] infection). 31. Adenovirus infections of chickens. 32. Quail bronchitis (QB). 33. Inclusion body hepatitis (IBH; Adenoviral Infection). 34. Hydropericardium syndrome (HS). 35. EGG drop syndrome 1976 (EDS 76). 36. Viral arthritis. 37. Fowl Pox (Pox; Avian Pox). 38. Infectious bursal disease (IBD; Gumboro Disease). 39. Marek’s disease. 40. Avian Leukosis (LL) (Lymphoid Leukosis, LL). 41. Myelocytomatosis. 42. Reticuloendotheliosis. 43. Avian Nephritis. 44. Avian Influenza (AI; Influenza; Fowl Plague). 45. Avian encephalomyelitis. 46. Coronaviral Enteritis of Turkeys (CVE) (Blue comb disease, mud fever, transmissible enteritis, infectious enteritis). 47. Hemorrhagic enteritis of Turkeys (HE; BLOODY GUT). 48. Duck virus enteritis (DVE, Duck Plague). 49. Duck Virus Hepatitis (DVH). 50. Eastern Equine Encephalitis (Eee) Virus Infection. 51. West Nile Virus (WNV). Section-IV: Fungal Diseases: 52. Aspergillosis (Brooder pneumonia). 53. Candidiasis (Thrush; Mycosis of Digestive Tract). 54. Cryptococcosis. 55. Dermatophytosis (FAVUS). 56. Mycotoxicosis. Section-V: Parasitic Disease: 57. Coccidiosis. 58. Cryptosporidiosis. 59. Histomoniasis (Black Head; Enterohepatitis). 60.Trichomoniasis. 61.Toxoplasmosis. 62. Nematodes (Round Worms). 63. Tapeworms (Cestodes). 64. Blood Borne Parasite. 65. Ectoparasites. Section-VI: Deficiency Diseases: 66. Vitamin deficiency. 67.Mineral deficiency. Section-VII: Miscellaneous Disorder: 68. Bumble foot (Pododermatitis/ Planter absces). 69.Cage layer fatigue (Osteoporosis). 70. Stunting runting syndrome. 71. Ascites syndrome (Water belly, Right ventricular failure, Hypertension syndrome). 72. Hypoglycemia-spiking mortality syndrome of broiler chickens (HSMS) 73. Proventricular dilatation of broiler chickens. 74. Round heart disease of chickens and turkeys (Dilated cardiomyopathy). Since past few decades because of changing demand for white meat from red meat, the small poultry farms and backyard poultry units developed to commercial farms. The adaptation of intensive poultry keeping methods and rearing of different species of poultry together has given rise to many disease problems. Since the inception of intensive poultry production worldwide farmers were struggling with severe diseases and huge economic losses in their unit. In order to keep pace with ever expanding poultry industry and meeting the increased demand for poultry products, knowledge for prevention and control of poultry diseases will be crucial. The book will enable veterinary students to have sound understanding and working knowledge of poultry diseases. The book will also assist personnel at the poultry disease diagnostic laboratories and progressive farmers. The book devotes total seven sections including basics about avian, bacterial diseases, viral diseases, fungal diseases, parasitic diseases, nutritional deficiency diseases and miscellaneous disorders affecting poultry. There are total 74 chapters in a capsule form. Emphasis has been put on etiology, transmission, epizootiology, clinical signs, gross and microscopic lesions, diagnosis, treatment and control. Where necessary, mention has been made on zoonoses. Necessary images and tables have been added to enhance the understanding of the diseases.