Communicable diseases 49 Communicable Diseases 27 Non-communicable Diseases and Injuries of Animals 16 Medical microbiology 12 Microbiological Phenomena 11 Infection 8 Epidemiology 7 Livestock 7 Microbiology 7 Prion, Viral, Bacterial and Fungal Pathogens of Animals, (New March 2000) 7 Protozoan, Helminth, Mollusc and Arthropod Parasites of Animals, (New March 2000) 7 Animal behaviour 6 Animal welfare 6 Behaviour 6 Public health 6 microbiology 6 Animal Behaviour 5 Animal Nutrition (General) 5 Animal Welfare 5 Diseases 5 Animal Physiology and Biochemistry (Excluding Nutrition) 4 Animal Reproduction and Embryology, (New March 2000) 4 Animal nutrition 4 Diagnosis 4 Disease control 4 Man 4 Mathematical models 4 Pets and Companion Animals 4 Sheep 4 Viruses 4