Download - Fungal Infections
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Fungal Infections
Slackers Facts by Mike Ori
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Disclaimer
The information represents my understanding only so errors and omissions are probably rampant. It has not been vetted or reviewed by faculty. The source is our class notes.
The document can mostly be used forward and backward. I tried to mark questionable stuff with (?).
If you want it to look pretty, steal some crayons and go to town.
Finally…
If you’re a gunner, buck up and do your own work.
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What is a tinea
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A superficial fungal infection defined by its anatomical location
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List common tinea locations and names
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Name Location
Capitis Head
Barbae Beard/face
Faciei Face
Corpus Body (ringworm)
Cruris Inguinal (Jock itch, usually not scrotum/penis)
Pedis Foot (Athletes foot)
Manuum Hands – expect pedis to be present too
Unguium Nails/nail bed (onychomycosis)
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Etiologic agent: Itchy scrotum
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Candida
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Vaginal candidiasis predisposing factors
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DiabetesAntibiotic use
PregnancyHIV
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What is a woods lamp and why is it used
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It is a UV lamp that causes some fungal infections to fluoresce and hence serves as a
diagnostic tool.
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What is the slide mount prep for fungal infections
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KOH prep
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Etiologic agent: Angular chelitis
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Candida
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Etiologic agent: Erythematous depapillation in midline of lingua
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Candida
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Etiologic agent: pseudomembranous plaques in mouth
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Candida
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Candida treatment
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Topicals - Nystatin rinse (swish and swallow), OTC azoles
Systemics – Triazoles or amphotericin B
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Onychomycosis sx
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Opaque, yellow, thickened, chalky nails with debris accumulation
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Onychomycosis tx
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Usually long term systemic anti-fungals like fluconazole, itraconazole, terbinafine.
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Aspergilla source
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Environment - soil
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Aspergillosis categories
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• Non-invasive• Allergic reaction• Aspergilloma
• Invasive• Chronic necrotizing
aspergillosis• Invasive pulmonary
aspergillosis
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Aspergilloma tx
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Surgical removal if aspergilloma is problematic. Medical tx cannot adequately penetrate the
ball.
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Chronic necrotizing aspergilloma features
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Invades lung parenchyma but does not invade vasculature
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Chronic necrotizing aspergilloma epidemiology
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Lung disease accompanied by “some” immune suppression
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Invasive pulmonary aspergillosis characterization
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Destruction of the lung parenchyma with invasion into the vasculature (angio invasive)
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Invasive pulmonary aspergillosis epidemiology
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Prolonged neutropenia as in cancer tx
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Fusariosis characterization
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Commensal organism on many grains that causes keratitis in contact lens users. Infection
occurs by direct inoculation and may spread systemically in immunocompromised hosts.
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Fusariosis risk factors
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Prolonged neutropenia or immune suppression due to allograft transplants
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Bioterror potential of Fusariosis
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Mycotoxins have been weaponized
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Scedosporis characterization
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Dimorphic fungus with clinical disease similar to Fusariosis.
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Scedosporiosis risk factors
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Prolonged neutropenia, immune suppression due to allograft transplants, diabetes.
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Zygomycosis chracterization.AKA: Mucormycosis
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Nasal sinus infection extending into the brain or orbit as a result of Mucorales species.
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Zygomycosis epidemiology
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Immune compromised hosts with acidemia as occurs in diabetes. Also occurs in poor
nutrition, burns, and neutropenia.
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Zygomycosis tx
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Aggressive surgical debridement
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Identify Etiology: A patient complains of dry cough, dyspnea, and fevers. CXR shows
diffuse bilateral interstitial infiltrate. ABG shows hypoxemia and hypocarbia. HX
includes treatment for rheumatoid arthritis.
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Pneumocystis jirovecii
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Is it likely the PT above is HIV +?
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While PJP is most commonly associated with HIV, it can occur in situations of depressed
cellular immunity independent of HIV status.
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What is the tx for PJP?
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TMP-SMX both for TX and prophylaxis.
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What is the likely illness of an HIV + with a CD4 < 100 individual that cleans chicken coops?
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Cryptococcus neoformans meningitis
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Cryptococcal DX tests
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India ink stains showing encapsulated yeast.Serology
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Cryptococcus TX
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Amphotericin B followed by fluconazole
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A 30 year old female presents to your clinic with complaining of a yeast infection that “won’t go away”. She has tried OTC treatment. She
has not been sexually active for the last 4 years. She is has never used IV drugs. What
tests would you recommend?
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HIV test. Recurrent or intractable yeast infections can be a sign of HIV. Remember
HIV can take years to develop. (Not sure if you would culture the infection)
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What are the signs of thrush.
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Angular chelitisMidline lingual erythema
PsuedomembranesDysphagia
Odynophagia
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A patient in the ICU suffered a traumatic laceration to their bowel. They are receiving
TPN and antibiotics. They are currently tachycardic, hypotensive, and febrile. Three
blood cultures drawn 4 hours apart are negative for bacteremia. What is the likely
agent.
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Candida fungemia
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Lab tests identify Candida krusei. What possible agent would you administer to resolve the
fungemia.
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Triazoles amphotericin Bechinocandins
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You administer triazoles but the patient does not improve. Why?
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Candida krusei is increasingly resistant to triazoles through a Ca++ dependent efflux
pump.
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What are the major endemic mycoses?
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HistoplasmosisBlastomycosis
CoccidioidomycosisParacoccidioidomycosis
SporotrichosisPenicillosis
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Describe the endemic mycoses morphology
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They are dimorphic and exist as yeast forms at body temperature.
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Histoplasmosis epidemiology
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Worldwide distribution with concentrations in the Mississippi and Ohio river valleys. In
particular areas with high nitrogen content such as bat caves.
I am the bat!!
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Histoplasmosis histology
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Macrophages with intracellular yeast that may be confused for ingested RBC’s
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Histoplasmosis DX
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HistologySerology
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Histoplasmosis treatment caveats
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Primary pneumonia usually does not require tx. Disseminated disease usually responds to intraconazole or amphotericin B if severe
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Blastomycosis epidemiology
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South and north central US in outdoorsy people with exposure to wooded areas. Hunters and
nudists (?).
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Blastomycosis histology
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Broad based budding yeast
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Blastomycosis serology caveats
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Serology is not useful as cross reactions to other common pathogens occurs.
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Coccidioidomycosis epidemiology
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Endemic in the soils of the San Joquin valley and parts of the southwestern US and northern
Mexico.
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Coccidioidomycosis histology
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Endospore containing spherule forms
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Coccidioidomycosis sx
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PneumoniaEosinophilia
Hilar and mediastinal lymphadenopathyNight sweats
FatigueWeight lossMeningitis
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Coccidioidomycosis meningitis prognosis and TX
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Universally fatal if not treated. TX with lifelong Fluconazole or itraconazole
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Describe role of anti-fungals in cocci
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Most primary cocci pneumonia resolves without TX so TX is reserved for prolonged disease
with high IgG titer and significant weight loss.
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Describe the utility of delayed type sensitivity testing in cocci diagnosis
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Not particularly useful as most people are seropositive. IgG titers are used to follow
course of disseminated disease.
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Compare the culture growth rate of Cocci, hist, blasto.
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Cocci – fast (days)Hist – slow (weeks)
Blasto – slow (weeks)
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Paracoccidioidomycosis epidemiology
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Endemic to Brazil
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Paracoccidioidomycosis sx
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Ulcerating skin, nasal, and oral lesions in middle aged and older males.
Associated with EtOH and tobacco use
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Paracoccidiodomycosis histology
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Steering wheel yeast forms
![Page 117: Fungal Infections](https://reader035.vdocuments.site/reader035/viewer/2022062323/568164dc550346895dd73595/html5/thumbnails/117.jpg)
Sporotrichosis epidemiology
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Occupational or recreational exposure to fungus living trees, shrubs, and soil. Commonly
associated with punctures from rose thorns.
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Sporotrichosis sx
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Lymphocutaneous disease with pustules, ulcers, and lymphangitic spread moving away from
site of injury.
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Clsssic sporotrichosis tx
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Potassium Iodide