| Allergen | Species - Scientific Name | Species - Common Name | Allergen Type | Allergen Description | Class |
| Can f 1 | Canis familiaris (Canis domesticus) | dog | animals | Dog 1 allergen
| IUIS |
| Can f 2 | Canis familiaris (Canis domesticus) | dog | animals | Dog 2 allergen
| IUIS |
| Can f 3 | Canis familiaris (Canis domesticus) | dog | animals | Serum albumin
| IUIS |
| Can f 4 | Canis familiaris (Canis domesticus) | dog | animals | N
| IUIS |
| Cand a 1 | Candida albicans | | fungi (moulds) Ascomycota Saccharomycetales | Alcohol dehydrogenase 1, EC 1.1.1.1; 40 kDa allergen; EC 1.1.1.1
| IUIS |
| Cand a 3 | Candida albicans | | fungi (moulds) Ascomycota Saccharomycetales | peroxisomal protein
| IUIS |
| Cand b 2 | Candida boidinii | | fungi (moulds) Ascomycota Saccharomycetales | Peroxisomal membrane protein (PMP20A)
| IUIS |
| Cap a 1w | Capsicum annuum | bell pepper | foods | osmotin-like protein; homolog: pathogenesis related protein PR5: Actinidin
| IUIS |
| Cap a 2 | Capsicum annuum | bell pepper | foods | profilin
| IUIS |
| Car b 1 | Carpinus betulus | hornbeam | tree Fagales | homolog: pathogenesis related protein PR10
| IUIS |
| Car b 1.0101 | Carpinus betulus | hornbeam | tree Fagales | Car b 1.1a
| IUIS |
| Car b 1.0102 | Carpinus betulus | hornbeam | tree Fagales | Car b 1.1b
| IUIS |
| Car b 1.0103 | Carpinus betulus | hornbeam | tree Fagales | 380
| IUIS |
| Car b 1.0104 | Carpinus betulus | hornbeam | tree Fagales | 383
| IUIS |
| Car b 1.0105 | Carpinus betulus | hornbeam | tree Fagales | 372
| IUIS |
| Car b 1.0106 | Carpinus betulus | hornbeam | tree Fagales | 541
| IUIS |
| Car b 1.0106 | Carpinus betulus | hornbeam | tree Fagales | 569
| IUIS |
| Car b 1.0106 | Carpinus betulus | hornbeam | tree Fagales | 553
| IUIS |
| Car b 1.0106 | Carpinus betulus | hornbeam | tree Fagales | 548
| IUIS |
| Car b 1.0107 | Carpinus betulus | hornbeam | tree Fagales | 385
| IUIS |
| Car b 1.0107 | Carpinus betulus | hornbeam | tree Fagales | 386
| IUIS |
| Car b 1.0108 | Carpinus betulus | hornbeam | tree Fagales | 295
| IUIS |
| Car b 1.0201 | Carpinus betulus | hornbeam | tree Fagales | Car b 1.2
| IUIS |
| Car b 1.0301 | Carpinus betulus | hornbeam | tree Fagales | 563
| IUIS |
| Car b 1.0302 | Carpinus betulus | hornbeam | tree Fagales | 2237
| IUIS |
| Car p 1 | Carica papaya | papaya | foods | papain
| IUIS |
| Cas s 1 | Castanea sativa | chestnut | tree Fagales | homolog: pathogenesis related protein PR10
| IUIS |
| Cas s 5 | Castanea sativa | chestnut | tree Fagales | chitinase
| IUIS |
| Cas s 8 | Castanea sativa | chestnut | tree Fagales | lipid transfer protein
| IUIS |
| Cav p 1 | Cavia porcellus | guinea pig | animals | lipocalin
| IUIS |
| Cav p 2 | Cavia porcellus | guinea pig | animals | Lipocalin family
| IUIS |
| Cha f 1 | Charybdis feriatus | crab | foods | tropomyosin
| non-IUIS |
| Cha o 1 | Chamaecyparis obtusa | Japanese cypress | tree Pinales | pectate lyase
| non-IUIS |
| Che a 1 | Chenopodium album | lamb's-quarters, pigweed, white goosefoo | weed Caryophyllales | N
| IUIS |
| Che a 2 | Chenopodium album | lamb's-quarters, pigweed, white goosefoo | weed Caryophyllales | profilin
| IUIS |
| Che a 3 | Chenopodium album | lamb's-quarters, pigweed, white goosefoo | weed Caryophyllales | polcalcin
| IUIS |
| Chi k 10 | Chironomus kiiensis | midge | insects | tropomyosin
| IUIS |
| Chi t 1 | Chironomus thummi thummi | midge | insects | hemoglobin
| IUIS |
| Chi t 1.01 | Chironomus thummi thummi | midge | insects | hemoglobin, component III; Globin CTT-III
| IUIS |
| Chi t 1.02 | Chironomus thummi thummi | midge | insects | hemoglobin, component IV
| IUIS |
| Chi t 2 | Chironomus thummi thummi | midge | insects | hemoglobin
| IUIS |
| Chi t 2.0101 | Chironomus thummi thummi | midge | insects | hemoglobin, component I
| IUIS |
| Chi t 2.0102 | Chironomus thummi thummi | midge | insects | hemoglobin, component IA
| IUIS |
| Chi t 3 | Chironomus thummi thummi | midge | insects | hemoglobin, component II-beta
| IUIS |
| Chi t 4 | Chironomus thummi thummi | midge | insects | hemoglobin, component IIIA
| IUIS |
| Chi t 5 | Chironomus thummi thummi | midge | insects | hemoglobin, component VI
| IUIS |
| Chi t 6 | Chironomus thummi thummi | midge | insects | hemoglobin
| IUIS |
| Chi t 6.01 | Chironomus thummi thummi | midge | insects | hemoglobin, component VIIA
| IUIS |
| Chi t 6.02 | Chironomus thummi thummi | midge | insects | hemoglobin, component IX
| IUIS |
| Chi t 7 | Chironomus thummi thummi | midge | insects | hemoglobin, component VIIB
| IUIS |
| Chi t 8 | Chironomus thummi thummi | midge | insects | hemoglobin, component VIII
| IUIS |
| Chi t 9 | Chironomus thummi thummi | midge | insects | hemoglobin, component X
| IUIS |
| Cit l 3 | Citrus limon | lemon | foods | lipid transfer protein
| IUIS |
| Cit s 1 | Citrus sinensis | sweet orange | foods | germin-like protein
| IUIS |
| Cit s 2 | Citrus sinensis | sweet orange | foods | profilin
| IUIS |
| Cit s 3 | Citrus sinensis | sweet orange | foods | lipid transfer protein
| IUIS |
| Cit s 3.0101 | Citrus sinensis | sweet orange | foods | lipid transfer protein
| IUIS |
| Cit s 3.0102 | Citrus sinensis | sweet orange | foods | lipid transfer protein
| IUIS |
| Cla h 1 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | N
| non-IUIS |
| Cla h 10 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | aldehyde dehydrogenase; old name: Cla h 3 (IUIS June/02/2005)
| IUIS |
| Cla h 12 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | acid ribosomal protein P1
| IUIS |
| Cla h 2 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | N
| IUIS |
| Cla h 3 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | aldehyde dehydrogenase; new name: Cla h 10 (IUIS June/02/2005); ALDDH; EC 1.2.1. | non-IUIS |
| Cla h 4 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | acid ribosomal protein P2; new name Cla h 5 (IUIS June/02/2005); Heat shock 70 k | non-IUIS |
| Cla h 5 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | acid ribosomal protein P2; old name Cla h 4, new name Cla h 7 (IUIS June/02/2005 | IUIS |
| Cla h 6 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | Enolase; Phosphoglycerate dehydratase; 2-phospho-D-glycerate hydro-lyase; EC 4.2 | IUIS |
| Cla h 7 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | YCP4 protein; old name Cla h 5 (IUIS June/02/2005)
| IUIS |
| Cla h 8 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | mannitol dehydrogenase
| IUIS |
| Cla h 9 | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | vacuolar serine protease
| IUIS |
| Cla h a | Cladosporium herbarum | | fungi (moulds) Ascomycota Dothidiales | N
| non-IUIS |
| Cop c 1 | Coprinus comatus | shaggy cap | fungi (moulds) Basidiomycotina Hymenomycetes | leucine zipper protein
| IUIS |
| Cop c 2 | Coprinus comatus | shaggy cap | fungi (moulds) Basidiomycotina Hymenomycetes | Thioredoxin
| IUIS |
| Cop c 3 | Coprinus comatus | shaggy cap | fungi (moulds) Basidiomycotina Hymenomycetes | N
| IUIS |
| Cop c 5 | Coprinus comatus | shaggy cap | fungi (moulds) Basidiomycotina Hymenomycetes | N
| IUIS |
| Cop c 7 | Coprinus comatus | shaggy cap | fungi (moulds) Basidiomycotina Hymenomycetes | N
| IUIS |
| Cor a 1 | Corylus avellana | hazelnut | foods | homolog: pathogenesis related protein PR10
| IUIS |
| Cor a 1.0101 | Corylus avellana | hazelnut | foods | Cor a 1/5
| IUIS |
| Cor a 1.0102 | Corylus avellana | hazelnut | foods | Cor a 1/6
| IUIS |
| Cor a 1.0103 | Corylus avellana | hazelnut | foods | Cor a 1/11
| IUIS |
| Cor a 1.0104 | Corylus avellana | hazelnut | foods | Cor a 1/16
| IUIS |
| Cor a 1.0201 | Corylus avellana | hazelnut | foods | CAGC10
| IUIS |
| Cor a 1.0301 | Corylus avellana | hazelnut | foods | CAGC11
| IUIS |
| Cor a 1.0401 | Corylus avellana | hazelnut | foods | N
| IUIS |
| Cor a 1.0402 | Corylus avellana | hazelnut | foods | N
| IUIS |
| Cor a 1.0403 | Corylus avellana | hazelnut | foods | N
| IUIS |
| Cor a 1.0404 | Corylus avellana | hazelnut | foods | N
| IUIS |
| Cor a 10 | Corylus avellana | hazelnut | foods | luminal binding protein
| IUIS |
| Cor a 11 | Corylus avellana | hazelnut | foods | 7S vicilin-like protein; 48-kDa glycoprotein
| IUIS |
| Cor a 2 | Corylus avellana | hazelnut | foods | profilin
| IUIS |
| Cor a 8 | Corylus avellana | hazelnut | foods | lipid transfer protein
| IUIS |
| Cor a 9 | Corylus avellana | hazelnut | foods | 11S globulin-like protein
| IUIS |
| Cra g 1 | Crassostrea gigas | Pacific oyster | foods | tropomyosin
| non-IUIS |
| Cro s 1 | Crocus sativus | saffron crocus | foods | Profilin
| IUIS |
| Cry j 1 | Cryptomeria japonica | Japanese cedar, sugi | tree Pinales | pectate lyase; SBP/ Sugi basic protein
| IUIS |
| Cry j 2 | Cryptomeria japonica | Japanese cedar, sugi | tree Pinales | Polygalacturonase; PG; Pectinase; EC 3.2.1.15
| IUIS |
| Cry j 2.0101 | Cryptomeria japonica | Japanese cedar, sugi | tree Pinales | N
| IUIS |
| Cry j 2.0102 | Cryptomeria japonica | Japanese cedar, sugi | tree Pinales | N
| IUIS |
| Cte f 1 | Ctenocephalides felis felis | cat flea | insects | Salivary antigen 1; FS-I
| IUIS |
| Cte f 2 | Ctenocephalides felis felis | cat flea | insects | M1b; salivary allergen 2
| IUIS |
| Cte f 3 | Ctenocephalides felis felis | cat flea | insects | N
| IUIS |
| Cte f 36kD | Ctenocephalides felis felis | cat flea | insects | N
| non-IUIS |
| Cuc m 1 | Cucumis melo | muskmelon | foods | serine protease; Cucumisin
| IUIS |
| Cuc m 2 | Cucumis melo | muskmelon | foods | profilin
| IUIS |
| Cuc m 3 | Cucumis melo | muskmelon | foods | PR-1 protein; Pathogenesis-related protein
| IUIS |
| Cul n 1 | Culicoides nubeculosus | midge | foods | ribosomal P0 protein
| non-IUIS |
| Cup a 1 | Cupressus arizonica | cypress | tree Pinales | Cha o 1 homologue
| IUIS |
| Cup a 3 | Cupressus arizonica | cypress | tree Pinales | pathogenesis-related protein
| non-IUIS |
| Cup s 1 | Cupressus sempervirens | common cypress | tree Pinales | N
| IUIS |
| Cup s 1.0101 | Cupressus sempervirens | common cypress | tree Pinales | clone 13
| IUIS |
| Cup s 1.0102 | Cupressus sempervirens | common cypress | tree Pinales | clone 15
| IUIS |
| Cup s 1.0103 | Cupressus sempervirens | common cypress | tree Pinales | clone 16
| IUIS |
| Cup s 1.0104 | Cupressus sempervirens | common cypress | tree Pinales | clone 18
| IUIS |
| Cup s 1.0105 | Cupressus sempervirens | common cypress | tree Pinales | clone 23
| IUIS |
| Cup s 3w | Cupressus sempervirens | common cypress | tree Pinales | N
| IUIS |
| Cyn d 1 | Cynodon dactylon | Bermuda grass | grass Poales | glycoprotein
| IUIS |
| Cyn d 1.0101 | Cynodon dactylon | Bermuda grass | grass Poales | CD1
| IUIS |
| Cyn d 1.0102 | Cynodon dactylon | Bermuda grass | grass Poales | clone 9.4
| IUIS |
| Cyn d 1.0103 | Cynodon dactylon | Bermuda grass | grass Poales | clone 9.9
| IUIS |
| Cyn d 1.0104 | Cynodon dactylon | Bermuda grass | grass Poales | clone 3.2
| IUIS |
| Cyn d 1.0105 | Cynodon dactylon | Bermuda grass | grass Poales | clone 2
| IUIS |
| Cyn d 1.0106 | Cynodon dactylon | Bermuda grass | grass Poales | clone 4.8
| IUIS |
| Cyn d 1.0107 | Cynodon dactylon | Bermuda grass | grass Poales | clone 5.4
| IUIS |
| Cyn d 1.0201 | Cynodon dactylon | Bermuda grass | grass Poales | clone 008
| IUIS |
| Cyn d 1.0202 | Cynodon dactylon | Bermuda grass | grass Poales | isoform 2
| IUIS |
| Cyn d 1.0203 | Cynodon dactylon | Bermuda grass | grass Poales | isoform 4
| IUIS |
| Cyn d 1.0204 | Cynodon dactylon | Bermuda grass | grass Poales | clone 009
| IUIS |
| Cyn d 12 | Cynodon dactylon | Bermuda grass | grass Poales | profilin
| IUIS |
| Cyn d 14 | Cynodon dactylon | Bermuda grass | grass Poales | new name: Cyn d 23
| non-IUIS |
| Cyn d 15 | Cynodon dactylon | Bermuda grass | grass Poales | Pollen allergen
| IUIS |
| Cyn d 2 | Cynodon dactylon | Bermuda grass | grass Poales | pollen allergen (group II)
| non-IUIS |
| Cyn d 22w | Cynodon dactylon | Bermuda grass | grass Poales | N
| IUIS |
| Cyn d 23 | Cynodon dactylon | Bermuda grass | grass Poales | old name: Cyn d 14
| IUIS |
| Cyn d 24 | Cynodon dactylon | Bermuda grass | grass Poales | pathogenesis-related protein
| IUIS |
| Cyn d 7 | Cynodon dactylon | Bermuda grass | grass Poales | Calcium binding protein B1; Polcalcin
| IUIS |
| Cyp c 1 | Cyprinus carpio | common carp | foods | parvalbumin
| non-IUIS |
| Cyp c 1.01 | Cyprinus carpio | common carp | foods | Parvalbumin; Calcium binding protein
| non-IUIS |
| Cyp c 1.02 | Cyprinus carpio | common carp | foods | parvalbumin
| non-IUIS |