mycology
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Transcript of mycology
HISTORY…
150 YEARS BACK AUGUSTINO BASSI in
Italy established that a fungus Beauveria bassiana was cause of disease in silk worm
In 1910RAYMOND JACQUES SABOURAUD published monumental work on dermatophytes
“LESTEIGNES”
He is known as FATHER OF MEDICAL MYCOLOGY
Many modern molecular techniques and others were developed to study the medical mycology but some are still in darkness…
ex:1.classification of parafungal organisms
2.some organisms such as Lacazia ioboi cultures are not done successfully
Ecological group of fungi
1.Soil fungi2.Aquatic fungi3.Coprophilus fungi4.Entomogenous fungi5.Predacious fungi6.Marine fungi7.Osmophilic fungi8.Thermophilic fungi
Myco as misnomer…
prefix “Myco” has been given to few bacteria
ex: Mycoplasma mycobacterium mycosis fungoides ???
MORPHOLOGY Fungi are eukaryotic protista rigid cell wall =chitin,mannan, polysaccharides cytoplasm membrane=sterols contains true nucleus, nuclear membrane, paired chromosomes.
Glossary unicellular budding yeast HYPHAE MYCELIUM (vegetative and
aerial) SPORANGIOSPORES CONIDIA CONIDIOPHORES ASCOSPORES BASIDIUM
Morphological classification
NAME EXAMPLE
1.Yeast Cryptococcus neoformans
2.Yeastlike Candida sps
3.Moulds dermatophytes
4.Dimorphic blastomycetes
PREDISPOSING FACTORS1.More aggressive treatment
modalities2. Immunocompremised3.AIDS4.Prosthetic devices5.Antibiotics6.Iv drug abusing7.Catheter usage
These predisposed factors leads to increased chances of fungal infections…
The same fungal agent can produce different manifestations depending on underlying situation
Based on the wide spectrum of adaptability various fungi are categorized in to
1.pathogenic fungi
2.opportunistic fungi
3.toxigenic fungi
4.allergenic fungi
Based on primary site of infection
1.superficial mycosis tinea or ring worm 2.cutaneous mycosis dermatophytosis 3.sub cutaneous mycosis mycotic mycetoma 4.systemic mycosis coccidiomycosis 5.opportunistic mycosis aspergillosis
Out breaks due to fungal infections do occur but only in SPORADIC forms and epidemic have not been reported
ex :incidence of cryptococcal meningitis cases by cryptococcus neoformans has increased 1000fold in new York city alone
LABORATORY DIAGNOSIS1.DIRECT MICROSCOPY KOH
preparation Calcoflour
white Gram staining Indian ink
preparation
3.Serological tests : agglutinations
CFT,CIE
ELISA,RIA
4.Skintests:histoplasmin test
5.Molecular methods: PCR,DNA probes
6.Typing methods7.Animal inoculation
USES1.Recycling2.As food3.Flavouring agents4.Russian or Manchurian tea5.Fermentation6.Antibiotic preparation 7.ergot-claviceps(as
vasoconstricting agent)8.Vaccine preparation and many
more….