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Studies have documented an increasing ability among such molds to resist medical treatments including triazole, the most potent anti-fungal in such cases, even in patients who have never taken the drug.

They found one variety — triazole–thiomorpholine dioxide alginate — that seemed to go completely unnoticed by the immune system2.

They may even be damaging, for example if an agricultural ban were to be imposed on triazole fungicides because of their endocrine-disrupting potential.

Pyrrol yields an analogous series: pyrazole, imidazole or glyoxaline, azimide or osotriazole, triazole and tetrazole: Six-membered ring systems can be referred back, in a manner similar to the above, to pyrone, penthiophene and pyridine, the substances containing a ring of five carbon atoms, and an oxygen, sulphur and nitrogen atom respectively.