V01A Allergens
V01AA Allergen extracts
:V01AA01 Feather
:V01AA02 Grass pollen
:V01AA03 House dust mites
:V01AA04 Mould fungus and yeast fungus
:V01AA05 Tree pollen
:V01AA07 Insects
:V01AA08 Food
:V01AA09 Textiles
:V01AA10 Flowers
:V01AA11 Animals
:V01AA20 Various