Species/Subspecies: Malassezia pachydermatis
Categories: Animal pathogen; human pathogen
Etymology: Genus name: Named after the French scientist Louis-Charles Malassez.
Species epithet: Greek for thick-skin.
Alternative Species Name(s):Pityrosporum malassez
Significance:  [Very important]   
Taxonomy:
PhylumClassOrderFamilyGenus
BasidiomycotaExobasidiomycetesMalassezialesMalasseziaceaeMalassezia
 
Macromorphology (smell):
Malassezia pachydermatis 
The colonies are creamy and yellowish and smooth to wrinkled and convex with an edge, which has a slightly lobed appearance. M. pachydermatis can be cultivated on Sabaroud agar.
Micromorphology: The size of the ovoidal cells are 3.0–6.5 x 2.5 µm.
Reproduction:
Enzymes: Catalase +
Spec. Char.: Optimal growth temperature is 30-37°C. M pachydermatis is the only species in its genus that grows in the absence of fatty acids, although growth is stimulated by fatty acids.
Reservoir: Can be found in the normal flora of the skin healthy mammals.
Disease/effect:
Hosts/materialDisease/effectClinical picture or result
DogOtitis externaSevere itching, head shaking as well as bad smell and reddish-brown waxy deposits in the ear canal.
DogSeborrhoeic dermatitisAreas of the skin along the back, which are rich in sebaceous glands, suffer from redness and white scales (dandruff) that come off.
CatOtitis externa can affect cats, but it is rare.See Dog
HumanSeborrhoeic dermatitis in infants and immunocompromised individuals.Reddening skin eczema, which scales.
Virulence Factors: Chondroitin-sulfatase, hyaluronidase, phospholipase and proteinase, which are tissue degrading enzymes.
Diagnostics: Cytological examination of the suspected area of the animal.
Genome Sequence:
ACC-No GenBankStrain/Isolate# of chromSize (Mbp)Ref
GCF_001278385 CBS 1879 08,1 # 3

Mitochondrial DNA sequence:  -
18S rRNA Seq:
ACC-No GenBankStrain/IsolateNumber of NT
EU192366 ATCC 14522 1557 

Taxonomy/phylogeny: About 20 species have been described within this genus.
Comment:The disease is zoonotic.
Reference(s): No. 20
Updated:2021-06-23

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Swedish University of Agricultural Sciences