1. Biology
   1. Botany
   2. Zoology
2. Biological classification
   1. Systematics
   2. Species
   3. Genus
   4. Family (biology)
   5. Order (biology)
   6. Class (biology)
   7. Phylum
   8. Kingdom (biology)
   9. Domain (biology)
3. Evolution
   1. Natural selection
4. Genetics
   1. DNA
   2. RNA
   3. Gene
   4. Heredity
5. Life
   1. Death
   2. Origin of life
6. Microbiology
7. Mycology
8. Adaptation
9. Genetic drift
10. Mutation
11. Paleontology
12. Phylogenetics

1. Anatomy
2. Camouflage
3. Cell (biology)
4. Endocrine system
5. Immune system
6. Organ (anatomy)
7. Tissue (biology)

Circulatory system, 7

1. Artery
2. Blood
3. Circulatory system
4. Heart
5. Red blood cell
6. Vein
7. White blood cell

Gastrointestinal tract, 9

1. Human digestive system
2. Colon (anatomy)
3. Small intestine
4. Liver
5. Large intestine
6. Mouth
7. Human tooth
8. Pancreas
9. Stomach

Integumentary system, 8

1. Integumentary system
2. Breast
3. Skin
4. Feather
5. Fur
6. Hair
7. Nail (anatomy)
8. Scale (anatomy)

Muscular system, 3

1. Muscular system
2. Myocyte
3. Skeletal striated muscle

Nervous system, 18

1. Nervous system
2. Brain
3. nerve
4. Sensory system
5. Auditory system
   1. Ear
6. Gustatory system
7. Olfactory system
   1. Nose
8. Somatosensory system
9. Visual system
   1. Eye
10. Intelligence
11. Hearing
12. Taste
13. Olfaction
14. Pain
15. Visual perception

Reproductive system, 7

1. Reproductive system
2. Penis
3. Vagina
4. Sex organ
5. Clitoris
6. Ovary
7. Testicle

Respiratory system, 3

1. Respiratory system
2. Lung
3. Gill

Skeletal system, 7

1. Skeleton
2. Bone
3. Chest
4. Pelvis
5. Skull
6. Vertebral column
7. Joint

Tissues, 4

1. Epithelium
2. Connective tissue
3. Muscle
4. Nervous tissue

Urinary system, 2

1. Kidney
2. Urinary bladder

1. Plant cell
   1. Cell wall
2. Bark
3. Berry
4. Flower
   1. Pollen
5. Fruit
6. Leaf
7. Root
8. Seed
9. Stoma

Life forms, 4

1. Herbaceous plant
2. Liana
3. Shrub
4. Tree

Plant stem, 3

1. Plant stem
2. Trunk (botany)
3. Wood

Plant tissues, 5

1. Epidermis (botany)
2. Ground tissue
3. Meristem
4. Vascular tissue
5. Vascular cambium

1. Hypha
2. Mycelium

1. Biomolecule
2. Biological pigment
   1. Carotenoid
   2. Chlorophyll
   3. Melanin
3. Carbohydrate
   1. Cellulose
   2. Starch
   3. Sugar
4. Fat
   1. Fatty acid
   2. Lipid
5. Protein
   1. Enzyme
   2. Hemoglobin
   3. Amino acid
6. Hormone
   1. Estrogen
   2. Testosterone
7. Alkaloid
8. Lactose
9. Chitin
10. Glycogen
11. Cholesterol
12. Molecular biology
13. Nucleic acid
14. Epinephrine
15. Plant hormone

1. Breathing
2. Homeostasis
3. Metabolism
4. Excretion
5. Respiration (physiology)

Basics, 13

1. Reproduction
2. Human development (biology)
3. Developmental biology
4. Asexual reproduction
5. Sexual reproduction
   1. Pregnancy
   2. Sex
      1. Female
      2. Male
6. Menstruation
7. Menstrual cycle
8. Menopause
9. Semen

Ontogeny, 16

1. Ontogeny
2. Cuticle
3. Egg (biology)
4. Embryo
5. Fetus
6. Imago
7. Larva
8. Longevity
9. Metamorphosis
10. Microbial cyst
11. Moulting
12. Nymph (biology)
13. Puberty
14. Pupa
15. Spore
16. Tadpole

Plant reproduction, 5[edit]

1. Plant reproduction
2. Gametophyte
3. Pollination
4. Alternation of generations
5. Sporophyte

1. Digestion

1. Photosynthesis
2. Transpiration

1. Ecology
2. Ecosystem
3. Endangered species
4. Extinction
5. Extremophile
6. Biome
7. Biodiversity
8. Competition (biology)
9. Ecological niche

Basic, 10[edit]

1. Animal
2. Arthropod
3. Chelicerata
4. Chordate
5. Gnathostomata
6. Hexapoda
7. Invertebrate
8. Nematode
9. Tetrapod
10. Vertebrate

1. Acari
2. Arachnid
3. Opiliones
4. Pseudoscorpion
5. Scorpion
6. Solifugae
7. Spider
   1. Tarantula

1. Crustacean
2. Amphipoda
3. Branchiopoda
4. Crab
5. Decapoda
6. Krill
7. Lobster
8. Malacostraca

1. Insect
2. Caddisfly
3. Earwig
4. Flea
5. Louse
6. Mantis
7. Mecoptera
8. Neuroptera
   1. Antlion
9. Phasmatodea (stick insects)
10. Plecoptera
11. Psocoptera
12. Strepsiptera
13. Thrips

Beetles (Coleoptera), 9

1. Beetle
2. Curculionidae
3. Coccinellidae (ladybird)
4. Firefly
5. Ground beetle
6. Leaf beetle
   1. Colorado potato beetle
7. Longhorn beetle
8. Scarabaeidae

Cockroaches (Blattodea), 2

1. Cockroach
2. Termite

Flies (Diptera), 6

1. Fly
2. Drosophila melanogaster (common fruit fly)
3. Horse-fly
4. Housefly
5. Mosquito
6. Tsetse fly

Hemiptera (true bugs), 6

1. Hemiptera
2. Cicada
3. Heteroptera (typical bugs)
   1. Bed bug
   2. Gerridae (water skaters)
4. Aphid (plant lice)

Hymenoptera, 6

1. Hymenoptera
2. Ant
3. Bee
   1. Bumblebee
   2. Western honey bee
4. Wasp

Lepidoptera, 12

1. Lepidoptera
2. Butterfly
   1. Swallowtail butterfly
   2. Lycaenidae (Blues and Coppers)
   3. Nymphalidae
   4. Pieridae (Yellow-Whites)
      1. Pieris brassicae
   5. Skipper (butterfly)
3. Moth
   1. Bombyx mori (domesticated silkmoth)
   2. Geometer moth
   3. Sphingidae

Odonata, 3

1. Odonata
2. Damselfly
3. Dragonfly

Orthoptera, 5

1. Orthoptera
2. Cricket (insect)
3. Grasshopper
4. Mole cricket
5. Tettigoniidae

1. Cnidaria
2. Coral
3. Jellyfish

1. Mollusca
2. Oyster
3. Octopus
4. Squid
5. Slug
6. Snail

1. Springtail
2. Myriapoda
3. Centipede
4. Millipede
5. Sea spider

1. Amphibian
2. Caecilian
3. Frog
4. Salamander
5. True frog

1. Bird
2. Archaeopteryx
3. Grebe
4. Flamingo
5. Hummingbird
6. Mousebird
7. Penguin
8. Sandgrouse
9. Tinamou
10. Tropicbird

Accipitriformes and Falconiformes, 6

1. Accipiter
2. Eagle
3. Falcon
4. New World vulture
5. Osprey
6. Secretarybird

Anseriformes, 4

1. Anatidae
2. Duck
3. Goose
4. Swan

Apodiformes, 1

1. Swift

Caprimulgiformes, 2

1. Caprimulgiformes
2. Nightjar

Charadriiformes, 7

1. Charadriiformes
2. Auk
3. Buttonquail
4. Gull
5. Sandpiper
6. Skua
7. Tern

Ciconiiformes, 5

1. Heron
2. Ibis
3. Shoebill
4. Spoonbill
5. Stork

Columbiformes, 3

1. Dodo
2. Columbidae
   1. Passenger Pigeon

Coraciiformes, 3

1. Bee-eater
2. Hornbill
3. Hoopoe

Cuculiformes, 3

1. Cuckoo
2. Hoatzin
3. Turaco

Galliformes, 7

1. Galliformes
2. Chicken
3. Grouse
4. Guineafowl
5. Common Pheasant
6. Common Quail
7. Turkey (bird)

Gruiformes, 4

1. Gruiformes
2. Crane (bird)
3. Bustard
4. Rallidae

Passerines, 23

1. Passerine
2. Songbird

Corvoidea, 5

1. Bird-of-paradise
2. Corvidae
   1. Corvus
   2. Eurasian Magpie
3. Shrike

Passerida, 16

1. Bulbul
2. Emberizidae
3. Finch
4. Lark
5. Motacillidae
6. Old World flycatcher
   1. European Robin
   2. Common Nightingale
7. Nuthatch
8. Sparrow
9. Starling
10. Sunbird
11. Swallow
12. Tit (bird)
13. Thrush (bird)
14. Wren

Pelecaniformes, 4

1. Cormorant
2. Darter
3. Frigatebird
4. Pelican

Piciformes, 4

1. Piciformes
2. Honeyguide
3. Toucan
4. Woodpecker

Procellariiformes, 3

1. Albatross
2. Procellariidae
3. Storm petrel

Psittaciformes, 3

1. Parrot
2. Budgerigar
3. Cockatoo

Ratites, 6

1. Cassowary
2. Emu
3. Kiwi
4. Moa
5. Ostrich
6. Rhea (bird)

Strigiformes, 5

1. Owl
2. True owl
3. Eurasian Eagle-Owl
4. Little Owl
5. Tytonidae

Trogoniformes, 1

1. Trogon

1. Fish
2. Chondrichthyes (cartilaginous fishes)
3. Acanthodii ("spiny sharks")
4. Osteichthyes (bony fish)
   1. Actinopterygii (ray-finned fish)
   2. Sarcopterygii (lobe-finned fish)
5. Placodermi
6. Electric eel
7. Anglerfish
8. Mullet (fish)
   1. Flathead mullet
9. Arapaima

Batoidea, 3

1. Batoidea
2. Sawfish
3. Electric ray

Characiformes, 2

1. Characiformes
2. Piranha

Chondrosteans, 1

1. Sturgeon

Clupeiformes, 3

1. Clupeiformes
2. Anchovy
3. Clupeidae

Cypriniformes, 8

1. Cypriniformes
2. Cyprinidae
   1. Common bream
   2. Carassius
   3. Common carp
   4. Goldfish
   5. Grass Carp
   6. Tench

Cyprinodontiformes, 1

1. Guppy

Elopomorpha, 1

1. Eel

Gadiformes, 3

1. Gadiformes
2. Burbot
3. Haddock

Perciformes, 8

1. Perciformes
2. Cichlid
3. Goby
4. European seabass
5. Swordfish
6. Remora
7. Scombridae
   1. Thunnus

Pleuronectiformes, 2

1. Flatfish
2. Turbot

Salmoniformes, 2

1. Salmonidae
2. Trout

Scorpaeniformes, 1

1. Scorpaeniformes

Sharks, 5

1. Shark
2. Great white shark
3. Hammerhead shark
4. Tiger shark
5. Whale shark

Siluriformes, 2

1. catfish
2. Wels catfish

Syngnathiformes, 1

1. Seahorse

Tetraodontiformes, 1

1. Tetraodontidae (pufferfish)

1. Dinosaur
2. Allosaurus
3. Ankylosaurus
4. Apatosaurus (Brontosaurus)
5. Brachiosaurus
6. Diplodocus
7. Stegosaurus
8. Triceratops
9. Tyrannosaurus
10. Velociraptor

1. Mammal
2. Aardvark
3. Armadillo
4. Colugo
5. Macroscelididae
6. Hyrax
7. Pangolin
8. Sirenia
9. Treeshrew

Bats, 4

1. Bat
2. Megabat
3. Microbat
4. Vampire bat

Carnivora, 35

1. Carnivora
2. Bear
   1. Brown bear
   2. Giant panda
   3. Polar bear
3. Canidae
   1. Dog
   2. Fox
   3. Coyote
   4. Gray wolf
   5. Jackal
4. Felidae
   1. Cat
   2. Cheetah
   3. Cougar
   4. Jaguar
   5. Leopard
   6. Lion
   7. Lynx
   8. Tiger
5. Hyena
6. Mongoose
7. Mustelidae
   1. European badger
   2. Honey badger
   3. Marten
   4. Otter
   5. Sable
   6. Sea otter
   7. Stoat
   8. Weasel
   9. Wolverine
8. Procyonidae
9. Skunk
10. Viverridae

Cetaceans, 8

1. Cetacea
2. Whale
3. Blue whale
4. Dolphin
5. Humpback whale
6. Killer whale
7. Porpoise
8. Sperm whale

Erinaceids, 2

1. Erinaceidae
2. Hedgehog

Even-toed ungulates, 36

1. Even-toed ungulate
2. Ruminantia
3. Bovid
   1. African buffalo
   2. American bison
   3. Antelope
   4. Capra (genus)
   5. Cattle
   6. Gazelle
   7. Gaur
   8. Goat
   9. Impala
   10. Muskox
   11. Sheep
   12. Water buffalo
   13. Wildebeest
   14. European bison
   15. Wild yak
4. Camel
   1. Bactrian camel
   2. Dromedary
5. Deer
   1. Elk
   2. Moose
   3. Red deer
   4. Reindeer
6. Llama
7. Giraffe
8. Guanaco
9. Hippopotamus
10. Peccary
11. Pig
    1. Wild boar
    2. Domestic pig
12. Pronghorn
13. Vicuña

Lagomorphs, 4

1. Lagomorpha
2. Hare
3. Pika
4. Rabbit

Marsupials, 6

1. Marsupial
2. Diprotodontia
   1. Kangaroo
   2. Koala
3. Dasyuromorphia
   1. Tasmanian devil

Monotremes, 3

1. Monotreme
2. Echidna
3. Platypus

Odd-toed ungulates, 7

1. Odd-toed ungulate
2. Donkey
3. Equidae
4. Horse
5. Rhinoceros
6. Tapir
7. Zebra

Pilosa, 1

1. Sloth

Pinnipeds, 4

1. Pinniped
2. Eared seal
3. Earless seal
4. Walrus

Primates, 16

1. Primate
2. Monkey
3. Ape
   1. Chimpanzee
   2. Gibbon
   3. Gorilla
   4. Orangutan
   5. Human
4. Old World monkey
   1. Baboon
   2. Macaque
   3. Rhesus macaque
5. Strepsirrhini
   1. Galago
   2. Lemur
6. Tarsier

Proboscidea, 4

1. Proboscidea
2. Elephant
3. Mammoth
4. Mastodon

Rodents, 15

1. Rodent
2. Capybara
3. Coypu
4. Beaver
5. Dipodidae
6. Dormouse
7. Guinea pig
8. Hamster
9. Marmot
10. Mouse
11. Muridae
12. Muskrat
13. Rat
14. Squirrel
15. Spermophilus

Soricomorpha, 2

1. Shrew
2. Talpidae

1. Reptile
   1. Alligator
2. Lizard -
   1. Chameleon
   2. Komodo dragon
   3. Gila monster
3. Snake
   1. Vipera berus
   2. Boidae
   3. Naja
   4. Hydrophiinae
4. Turtle
   1. Galápagos tortoise
   2. Sea turtle
      1. Green sea turtle
      2. Leatherback sea turtle
      3. Loggerhead sea turtle
   3. Tortoise
5. Tuatara

1. Dimetrodon
2. Agnatha
3. Hagfish

1. Fern
2. Marchantiophyta
3. Moss
4. Equisetum

1. Angiosperms
2. Geranium
3. Lilium
4. Convolvulaceae (Morning glory)

Asparagales, 9

1. Asparagales
2. Agave
3. Aloe
4. Gladiolus
5. Iridaceae
6. Lily of the Valley
7. Narcissus (plant)
8. Orchidaceae
9. Yucca

Alismatales, 3

1. Alismatales
2. Araceae
3. Anthurium

Ericales, 6

1. Ericales
2. Ericaceae
   1. Rhododendron
3. Theaceae
   1. Camellia
4. Primulaceae (Primrose)

Asterales, 9

1. Asterales
2. Asteraceae
   1. Chrysanthemum
   2. Dahlia
   3. Bellis perennis
   4. Taraxacum
   5. Sunflower
   6. Tagetes (Marigold)
3. Campanulaceae (Bellflowers)

Gentianales, 2

1. Gentianales
2. Apocynaceae (dogbane family)

Brassicales, 1

1. Brassicales

Cucurbitales, 1

1. Cucurbitaceae

Poales, 3

1. Poales
2. Poaceae or Gramineae (grass family)
   1. Bamboo

Rosales, 6

1. Rosales
2. Rosaceae
   1. Almond
   2. Rose
3. Ulmaceae
   1. Elm

Lamiales, 5

1. Lamiales
2. Lamiaceae or Labiatae (mint family)
3. Oleaceae
   1. Fraxinus (Ash tree)
4. Salvia

Malpighiales, 4

1. Malpighiales
2. Euphorbiaceae (spurge family)
3. Poinsettia
4. Viola (plant)

Malvales, 2

1. Malvaceae
   1. Adansonia (Baobab)

Myrtales, 3

1. Myrtales
2. Myrtaceae (myrtle family)
   1. Eucalyptus

Fagales, 11

1. Fagales
2. Betulaceae
   1. Alder
   2. Birch
   3. Hazel
   4. Hornbeam
3. Fagaceae
   1. Chestnut
   2. Beech
   3. Oak
4. Juglandaceae (Wallnut)

Sapindales, 2

1. Sapindales
2. Cashew

Arecales, 2

1. Arecaceae (Palm tree)
2. Coconut

Proteales, 2

1. Nelumbo
2. Platanus

Cornales, 1

1. Cornus (genus) (Dogwood tree)

Fabales, 2

1. Fabales
2. Fabaceae

Urticales, 1

1. Moraceae

1. Cedrus
2. Cypress
3. Fir
4. Juniper
5. Pine
6. Spruce

1. Apple
2. Apricot
3. Avocado
4. Banana
5. Blackberry
6. Breadfruit
7. Cherry
8. Citrus fruits
   1. Kumquat
   2. Lemon
   3. Lime (fruit)
   4. Orange (fruit)
9. Common fig
10. Cucumber
11. Cranberry
12. Redcurrant
13. Blackcurrant
14. Date palm
15. Eggplant
16. Grape
17. Guava
18. Jackfruit
19. Kiwifruit
20. Lychee
21. Mango
22. Morus (plant)
23. Olive
24. Papaya
25. Peach
26. Pear
27. Pineapple
28. Pomegranate
29. Strawberry
30. Watermelon

1. Vegetable

Amaranthaceae, 2

1. Beet
2. Chard

Allium, 2

1. Leek
2. Shallot

Apiaceae, 3

1. Carrot
2. Celery
3. Cumin

Asteraceae, 5

1. Artichoke
2. Jerusalem artichoke
3. Chicory
4. Endive
5. Lettuce

Brassicaceae, 8

1. Eruca sativa
2. Cabbage
3. Cauliflower
4. Broccoli
5. Kohlrabi
6. Radish
7. Rutabaga
8. Turnip

Solanaceae, 3

1. Chili pepper
2. Potato
3. Tomato

Fabaceae, 7

1. Legume
2. Pea
3. Bean
   1. Vicia faba
   2. Soybean
   3. Common bean
4. Peanut

Other, 6

1. Asparagus
2. Cassava
3. Okra
4. Portulaca oleracea
5. Sorrel
6. Sweet potato

Grain, 12

1. Barley
2. Maize
3. Oat
4. Rice
5. Sorghum
6. Wheat
   1. Spelt
7. Millet
8. Rye
9. Buckwheat
10. Amaranth
11. Quinoa

1. Fungus
2. Mushroom
3. Ascomycota
4. Basidiomycota
5. Zygomycota

Edible fungi, 6

1. Agaricus
2. Boletus edulis
3. Chanterelle
4. Pleurotus ostreatus
5. Shiitake
6. Truffle

Poisonous fungi, 2

1. Amanita muscaria
2. Amanita phalloides (Death cap)

1. Eukaryote
2. Archaea
3. Bacteria -
   1. Escherichia coli
4. Protist
5. Prion
6. Virus
   1. HIV
7. Algae
8. Plankton

Horses, 13

1. Arabian horse
2. Andalusian horse
3. Appaloosa
4. Clydesdale horse
5. Friesian horse
6. Hackney
7. Lipizzan
8. Morgan
9. Palomino
10. American Quarter Horse
11. Standardbred
12. Thoroughbred
13. Pony

Cats, 2

1. Siamese (cat)
2. Manx cat

Cattle, 4

1. Brahman (cattle)
2. Hereford
3. Highland cattle
4. Holstein

Dogs, 10

1. Beagle
2. Chihuahua (dog)
3. Dachshund
4. Dalmatian (dog)
5. Great Dane
6. Greyhound
7. Retriever
8. German Shepherd
9. Shih Tzu
10. Terrier

1. Health
2. Physical fitness
   1. Body mass index
   2. Physical exercise
   3. Hygiene
   4. Obesity
   5. Weight loss
3. Stress (biology)
4. Suicide
5. Nutrition
   1. Diet (nutrition)
   2. Dietary supplement
   3. Malnutrition
6. Substance abuse
   1. Addiction
   2. Alcoholism
   3. Substance dependence
7. Drug
   1. Cannabis
   2. Tobacco
   3. Opium
8. Mental health
9. Ageing
10. Hunger
11. Smoking

General concepts, 66[edit]

1. Medicine
   1. Health care
2. Physicians and other professionals
   1. General practitioner
   2. Nursing
   3. Surgeon
3. Blood transfusion
4. Coma
   1. Persistent vegetative state
5. Disability
   1. Autism
   2. Blindness
   3. Color blindness
   4. Deafness
   5. Down syndrome
   6. Mental retardation
6. Hospital
7. Injury
   1. Bone fracture
   2. Bruise
   3. Burn
   4. Frostbite
   5. Wound
   6. Snakebite
8. Anesthesia
9. Chemotherapy
10. Medical diagnosis
11. Organ transplantation
12. Palliative care
13. Radiation therapy
14. Surgery
15. Artificial organ
16. Pandemic
17. Physical examination
    1. Autopsy
    2. Biopsy
    3. Blood pressure
    4. Blood test
    5. DNA profiling
    6. Electrocardiography
    7. Endoscopy
    8. Eye examination
    9. Lumbar puncture
    10. Magnetic resonance imaging
    11. Pap test
    12. Pulse
    13. Radiology
    14. Reflex
    15. Urinalysis
18. Poison
    1. Toxin
19. Aneurysm
20. Brain damage
21. Bleeding
22. Cardiac arrest
23. Hypoxia (medical)
24. Inflammation
25. Myocardial infarction
26. Respiratory failure
27. Shock (circulatory)
28. Stroke
29. Syndrome
    1. Symptom
30. Headache
31. Vaccination
    1. Vaccine

Fields of medicine, 38[edit]

1. Alternative medicine
   1. Homeopathy
2. Angiology
3. Cardiology
4. Dentistry
   1. Dental caries
   2. Dental restoration
   3. Root canal
   4. Toothache
5. Dermatology
6. Dietitian
7. Gastroenterology
8. Geriatrics
9. Hematology
10. Immunology
11. Neurology
12. Obstetrics and gynaecology
13. Oncology
14. Ophthalmology
15. Otolaryngology
16. Pediatrics
17. Pharmacy
    1. Essential medicines
    2. Pharmaceutical drug
    3. Pharmacist
18. Pharmacology
    1. Pharmacokinetics
    2. Antibacterial
       1. Penicillin
    3. Management of HIV/AIDS
19. Psychiatry
20. Pulmonology
21. Reproductive health
22. Toxicology
23. Traditional medicine
24. Traumatology
25. Urology
26. Veterinary medicine

Disease, 17

1. Disease
   1. Allergy
   2. Alzheimer's disease
   3. Asthma
   4. Bronchitis
   5. Cirrhosis
   6. Chronic obstructive pulmonary disease
   7. Dementia
   8. Diabetes mellitus
   9. Epilepsy
   10. Gastroenteritis
   11. Parkinson's disease
   12. Heart disease
   13. Hepatitis
   14. Hypertension
   15. Meningitis
   16. Multiple sclerosis

Cancer, 11

1. Cancer
   1. Breast cancer
   2. Colorectal cancer
   3. Leukemia
   4. Lung cancer
   5. Lymphoma
   6. Prostate cancer
   7. Skin cancer
      1. Melanoma
   8. Tumor
      1. Brain tumor

Foodborne illness, 5

1. Foodborne illness
   1. Botulism
   2. Mushroom poisoning
   3. Typhoid fever
   4. Salmonellosis

Infectious disease, 38

1. Infectious disease
   1. Pathogen
   2. Sexually transmitted disease
      1. AIDS
      2. Gonorrhea
      3. Herpes simplex
      4. Syphilis
   3. Anthrax
   4. Bubonic plague
   5. Chickenpox
   6. Cholera
   7. Common cold
   8. Dengue fever
   9. Diphtheria
   10. Dysentery
   11. Encephalitis
   12. Gangrene
   13. Ebola virus disease
   14. Hand, foot and mouth disease
   15. Influenza
       1. Influenza A virus subtype H5N1
   16. Leprosy
   17. Lyme disease
   18. Malaria
   19. Measles
   20. Mumps
   21. Pertussis (Whooping Cough)
   22. Pneumonia
   23. Poliomyelitis
   24. Rabies
   25. Severe acute respiratory syndrome
   26. Scabies
   27. Scarlet fever
   28. Smallpox
   29. Tetanus
   30. Tuberculosis
   31. Typhus
   32. Yellow fever

Mental illness, 9

1. Mental disorder
   1. Bipolar disorder
   2. Major depressive disorder
   3. Neurosis
   4. Posttraumatic stress disorder
   5. Psychosis
      1. Delusion
      2. Hallucination
   6. Schizophrenia