Communicable diseases 25 Microbiology 22 Pathogens, Parasites and Infectious Diseases (Wild Animals), (New March 2000) 21 Medical microbiology 19 Infectious diseases 17 Natural enemies 16 Communicable Diseases 14 Plant Pests, (New March 2000) 13 Biological Control 12 Biological control agents 12 Diagnostic microbiology 12 Entomopathogens 12 Epidemiology 12 Pathogens 12 Medicine 11 Biological control 10 Immunology 10 Plant pests 10 Microbiological Techniques 9 Pest control 9 Bacteria 8 Entomophilic nematodes 8 Human diseases 8 Insects 8 Immunity 7 Man 7 Nematoda 7 Prion, Viral, Bacterial and Fungal Pathogens of Humans, (New March 2000) 7 Protozoan, Helminth and Arthropod Parasites of Humans, (New March 2000) 7 Taxonomy 7