Q134: Paracoccidioidomycosis is also known as:

A) North American blastomycosis
B) European blastomycosis
C) South American blastomycosis
D) African histoplasmosis
✅ Correct Answer: C) South American blastomycosis

Q135: Another name for Paracoccidioidomycosis is:

A) Lutz-Splendore-Almeida disease
B) San Joaquin Valley fever
C) Chicago disease
D) Rose thorn disease
✅ Correct Answer: A) Lutz-Splendore-Almeida disease

Q136: P. brasiliensis is a thermally dimorphic fungus that occurs as mold in soil and as yeast in tissue. The unique characteristic of its yeast form is:

A) Single narrow-based bud
B) Multiple blastoconidia from multiple sites resembling "Mickey Mouse head" or "pilot wheel"
C) Formation of pseudohyphae
D) Production of a polysaccharide capsule
✅ Correct Answer: B) Multiple blastoconidia from multiple sites resembling "Mickey Mouse head" or "pilot wheel"

Q137: The characteristic appearance of P. brasiliensis helps to differentiate it from:

A) Histoplasma capsulatum
B) Cryptococcus neoformans
C) Blastomyces dermatitidis
D) Coccidioides immitis
✅ Correct Answer: C) Blastomyces dermatitidis

Q138: Paracoccidioidomycosis infection occurs by:

A) Direct skin contact with infected person
B) Inhalation of conidia or mycelial fragments, or orally by ingestion
C) Insect bites
D) Blood transfusion
✅ Correct Answer: B) Inhalation of conidia or mycelial fragments, or orally by ingestion

Q139: The primary site of infection in Paracoccidioidomycosis is:

A) Skin
B) Central nervous system
C) Lungs
D) Liver
✅ Correct Answer: C) Lungs

Q140: The most important defense mechanism in Paracoccidioidomycosis is:

A) Humoral immunity (IgG)
B) Cell-mediated immunity (CMI)
C) Macrophages only
D) NK cells only
✅ Correct Answer: B) Cell-mediated immunity (CMI)

Q141: Laboratory diagnosis of Paracoccidioidomycosis depends on demonstration of:

A) India ink for capsule
B) Large, multiple budding yeasts (blastoconidia) in 30% KOH wet mount of sputum
C) Germ tube test
D) Urease test
✅ Correct Answer: B) Large, multiple budding yeasts (blastoconidia) in 30% KOH wet mount of sputum

Q142: The organism of Paracoccidioidomycosis is isolated by culture on SDA at 37°C after:

A) 1-2 days
B) 5-7 days
C) 20-30 days
D) 3 months
✅ Correct Answer: C) 20-30 days

Q143: Histoplasmosis is primarily a disease of:

A) Central nervous system
B) Reticuloendothelial system caused by Histoplasma capsulatum
C) Skin and nails
D) Urinary system
✅ Correct Answer: B) Reticuloendothelial system caused by Histoplasma capsulatum

Q144: Histoplasma capsulatum is an intracellular fungus that multiplies inside:

A) Red blood cells
B) Macrophages
C) T cells
D) Neurons
✅ Correct Answer: B) Macrophages

Q145: H. capsulatum on SDA at 25°C is characterized by:

A) Yeast cells only
B) Thin, branching, septate hyphae that produce tuberculate macroconidia and microconidia
C) Spherules
D) Pseudohyphae
✅ Correct Answer: B) Thin, branching, septate hyphae that produce tuberculate macroconidia and microconidia

Q146: H. capsulatum infection is acquired by:

A) Direct skin contact
B) Inhalation of conidia and mycelial fragments from contaminated soil
C) Ingestion of contaminated food
D) Insect bites
✅ Correct Answer: B) Inhalation of conidia and mycelial fragments from contaminated soil

Q147: Inside the lungs, H. capsulatum multiplies within macrophages approximately every:

A) 1-2 hours
B) 6-8 hours
C) 15-18 hours
D) 48 hours
✅ Correct Answer: C) 15-18 hours

Q148: Bats play an important role in transmission of Histoplasmosis through:

A) Direct bites
B) Their droppings contaminating the soil
C) Breathing on humans
D) Skin contact
✅ Correct Answer: B) Their droppings contaminating the soil

Q149: The incubation period of Histoplasmosis varies from:

A) 1-3 days
B) 3-14 days
C) 1 month
D) 6 months
✅ Correct Answer: B) 3-14 days

Q150: Progressive disseminated histoplasmosis is seen in:

A) Completely healthy individuals
B) Young children only
C) Immunocompromised patients such as AIDS patients
D) Elderly only
✅ Correct Answer: C) Immunocompromised patients such as AIDS patients

Q151: Laboratory diagnosis of Histoplasmosis depends on demonstration of:

A) Spherules in sputum
B) Oval yeast cells within macrophages in bone marrow aspirates and tissue biopsy specimens
C) Arthroconidia in hair
D) Pseudohyphae in blood
✅ Correct Answer: B) Oval yeast cells within macrophages in bone marrow aspirates and tissue biopsy specimens

Q152: Anti-H antibody in Histoplasmosis is:

A) Least specific and not useful
B) More specific for active histoplasmosis, positive in 50-80% of patients, remains elevated for years
C) Disappears quickly after recovery
D) Found only in normal persons
✅ Correct Answer: B) More specific for active histoplasmosis, positive in 50-80% of patients, remains elevated for years

Q153: Serological tests useful for diagnosis of Histoplasmosis include:

A) India ink and Latex agglutination
B) Complement-fixation test (CFT) and Immunodiffusion (ID)
C) Germ tube test and Urease test
D) KOH preparation and LPCB
✅ Correct Answer: B) Complement-fixation test (CFT) and Immunodiffusion (ID)

Q154: Blastomycosis is a granulomatous fungal infection caused by:

A) Histoplasma capsulatum
B) Coccidioides immitis
C) Blastomyces dermatitidis
D) Paracoccidioides brasiliensis
✅ Correct Answer: C) Blastomyces dermatitidis

Q155: B. dermatitidis in tissue at 37°C appears as:

A) Spherule filled with endospores
B) Round yeast with double refractile wall and a single broad-based bud
C) Encapsulated yeast with thin wall
D) Pseudohyphae
✅ Correct Answer: B) Round yeast with double refractile wall and a single broad-based bud

Q156: What differentiates B. dermatitidis from Cryptococcus neoformans in tissue?

A) B. dermatitidis has a capsule
B) B. dermatitidis has broad-based bud while C. neoformans has narrow-based bud
C) B. dermatitidis is smaller
D) B. dermatitidis is Gram-positive
✅ Correct Answer: B) B. dermatitidis has broad-based bud while C. neoformans has narrow-based bud

Q157: B. dermatitidis in soil at 25°C produces:

A) Spherules
B) Mycelial growth showing typical pyriform microconidia (2-4 µm)
C) Encapsulated yeast
D) Rectangular arthrospores
✅ Correct Answer: B) Mycelial growth showing typical pyriform microconidia (2-4 µm)

Q158: B. dermatitidis infection occurs by:

A) Animal contact
B) Inhalation of microconidia from soil
C) Ingestion of contaminated food
D) Direct skin wound inoculation
✅ Correct Answer: B) Inhalation of microconidia from soil

Q159: The thick cell wall of B. dermatitidis yeasts offers:

A) More antigenic stimulation
B) Resistance to phagocytosis
C) Higher replication rate
D) Distinctive staining characteristics
✅ Correct Answer: B) Resistance to phagocytosis

Q160: The most common site of extrapulmonary Blastomycosis is:

A) Brain
B) Bones
C) Skin
D) Liver
✅ Correct Answer: C) Skin

Q161: Cryptococcosis is also called:

A) North American blastomycosis
B) South American blastomycosis
C) European blastomycosis
D) African cryptococcosis
✅ Correct Answer: C) European blastomycosis

Q162: Cryptococcus neoformans is:

A) A mold (Aspergillus-like)
B) A dimorphic fungus
C) An encapsulated true yeast
D) An intracellular fungus
✅ Correct Answer: C) An encapsulated true yeast

Q163: The diameter of C. neoformans is:

A) 1-2 µm
B) 3-6 µm
C) 10-20 µm
D) 30-60 µm
✅ Correct Answer: B) 3-6 µm

Q164: The polysaccharide capsule of C. neoformans is composed of:

A) Chitin + Mannan + Beta-glucan
B) Mannose + Xylose + Glucuronic acid
C) Glucose + Galactose + Fructose
D) Peptidoglycan + Teichoic acid
✅ Correct Answer: B) Mannose + Xylose + Glucuronic acid

Q165: The polysaccharide capsule of C. neoformans is:

A) Promotes phagocytosis
B) Antiphagocytic (prevents recognition by phagocytes)
C) Stimulates cell-mediated immunity
D) Has no role in pathogenesis
✅ Correct Answer: B) Antiphagocytic (prevents recognition by phagocytes)

Q166: C. neoformans on SDA medium forms:

A) Green velvety colonies
B) Black shiny colonies
C) Smooth, convex, cream-colored colonies at 20-37°C
D) White cottony colonies
✅ Correct Answer: C) Smooth, convex, cream-colored colonies at 20-37°C

Q167: Cryptococcosis is the most common life-threatening fungal disease in:

A) Newborn infants
B) Diabetic patients
C) Patients with AIDS
D) Elderly patients
✅ Correct Answer: C) Patients with AIDS

Q168: C. neoformans is primarily transmitted by:

A) Skin contact
B) Inhalation
C) Ingestion of contaminated food
D) Blood transfusion
✅ Correct Answer: B) Inhalation

Q169: India ink preparation of CSF in Cryptococcal meningitis shows:

A) Rectangular arthrospores
B) Capsule of C. neoformans appearing as a clear halo around the yeast cells
C) Pseudohyphae of Candida
D) Spherules with endospores
✅ Correct Answer: B) Capsule of C. neoformans appearing as a clear halo around the yeast cells

Q170: By India ink method, Cryptococci can be demonstrated in what percentage of patients with Cryptococcal meningitis?

A) 5-10%
B) 10-20%
C) 25-50%
D) 80-90%
✅ Correct Answer: C) 25-50%

Q171: The stain that preferentially stains C. neoformans in fixed tissue is:

A) Gram stain
B) India ink
C) Mucicarmine
D) Giemsa
✅ Correct Answer: C) Mucicarmine

Q172: Latex Agglutination Test (LAT) in Cryptococcosis detects:

A) IgM antibodies
B) Cryptococcal polysaccharide antigen in serum or CSF
C) Mannan in Candidiasis
D) Galactomannan in Aspergillosis
✅ Correct Answer: B) Cryptococcal polysaccharide antigen in serum or CSF

Q173: Gram-stained smear of CSF in Cryptococcosis shows:

A) Gram-negative yeast cells
B) Gram-positive yeast cells
C) Gram-variable organisms
D) No staining
✅ Correct Answer: B) Gram-positive yeast cells

Q174: C. neoformans has two varieties:

A) C. neoformans var. fumigatus and var. niger
B) C. neoformans var. neoformans and var. gattii
C) C. neoformans var. albicans and var. tropicalis
D) C. neoformans var. immitis and var. brasiliensis
✅ Correct Answer: B) C. neoformans var. neoformans and var. gattii

Q175: Glucosylceramide synthase in C. neoformans is:

A) A fungal toxin causing tissue damage
B) An essential factor for survival of C. neoformans in pulmonary alveoli
C) An antigen used in diagnosis
D) An enzyme for capsule synthesis
✅ Correct Answer: B) An essential factor for survival of C. neoformans in pulmonary alveoli

Q176: C. neoformans usually causes most serious infections in patients with impaired CMI, including all EXCEPT:

A) Patients with AIDS
B) Patients undergoing corticosteroid treatment
C) Patients with intact immunity
D) Patients undergoing organ transplantation
✅ Correct Answer: C) Patients with intact immunity

Q177: The most common fungal pathogens that affect humans are:

A) Aspergillus species
B) Cryptococcus species
C) Candida species
D) Mucor species
✅ Correct Answer: C) Candida species

Q178: C. albicans forms part of the normal flora of:

A) Normal skin only
B) Gastrointestinal tract, genitourinary tract, and respiratory tract
C) Brain and spinal cord
D) Blood and lymph
✅ Correct Answer: B) Gastrointestinal tract, genitourinary tract, and respiratory tract

Q179: Candida grows readily on SDA, and C. albicans produces:

A) Green velvety colonies
B) Creamy white, smooth colonies with a yeasty odor
C) Black shiny colonies
D) Gray-white colonies with green center
✅ Correct Answer: B) Creamy white, smooth colonies with a yeasty odor

Q180: Germ tube test is a rapid method for identification of:

A) Cryptococcus neoformans
B) Aspergillus fumigatus
C) Candida albicans and Candida dubliniensis
D) Histoplasma capsulatum
✅ Correct Answer: C) Candida albicans and Candida dubliniensis

Q181: In the Germ tube test, C. albicans produces germ tube within 2 hours when incubated in human serum at:

A) 25°C
B) 37°C
C) 42°C
D) 4°C
✅ Correct Answer: B) 37°C

Q182: The phenomenon of germ tube production by C. albicans is called:

A) Endosporulation
B) Reynold-Braude phenomenon
C) Dimorphism phenomenon
D) Blastospore phenomenon
✅ Correct Answer: B) Reynold-Braude phenomenon

Q183: Chlamydospores are typically produced by C. albicans on:

A) SDA at 37°C
B) Blood agar at 37°C
C) Cornmeal agar at 25°C
D) CHROM agar at 42°C
✅ Correct Answer: C) Cornmeal agar at 25°C

Q184: C. albicans and Candida glabrata are responsible for causing infection in what percentage of patients with invasive candidiasis?

A) 20-30%
B) 40-50%
C) 70-80%
D) 95-100%
✅ Correct Answer: C) 70-80%

Q185: Demonstration of pseudohyphae in a clinical specimen indicates:

A) Contamination only
B) Infection and tissue invasion (of more diagnostic value)
C) Superficial infection only
D) Treated fungal infection
✅ Correct Answer: B) Infection and tissue invasion (of more diagnostic value)

Q186: The first stage in the pathogenesis of Candidal infection is:

A) Direct entry into bloodstream
B) Colonization of the mucocutaneous surface
C) Toxin production
D) Immune suppression
✅ Correct Answer: B) Colonization of the mucocutaneous surface

Q187: The most important predisposing condition for life-threatening Candida infection in patients with hematologic malignancies is:

A) High fever
B) Severe neutropenia
C) Low IgG
D) Decreased T cells
✅ Correct Answer: B) Severe neutropenia

Q188: The most common manifestation of Candidiasis is:

A) Disseminated candidiasis
B) Systemic candidiasis
C) Mucocutaneous candidiasis (thrush)
D) Candidemia
✅ Correct Answer: C) Mucocutaneous candidiasis (thrush)

Q189: Skin test with Candida antigen in immunocompetent adults is:

A) Always negative
B) Uniformly positive (indicates intact CMI)
C) Variable
D) Unreliable
✅ Correct Answer: B) Uniformly positive (indicates intact CMI)

Q190: Skin test with Candida antigen is negative in individuals who:

A) Are normal healthy adults
B) Have deficient CMI (anergic individuals)
C) Have acute Candidiasis
D) Are diabetic patients
✅ Correct Answer: B) Have deficient CMI (anergic individuals)

Q191: Only C. albicans produces chlamydospores on cornmeal agar at 25°C. Which statement about CHROM agar is correct?

A) It cannot differentiate Candida species
B) It allows presumptive identification of several Candida species by color reaction
C) It requires 37°C for identification
D) It shows the same color for all Candida species
✅ Correct Answer: B) It allows presumptive identification of several Candida species by color reaction

Q192: Treatment of Candida infections includes all of the following EXCEPT:

A) Fluconazole
B) Amphotericin B
C) Nystatin
D) Penicillin
✅ Correct Answer: D) Penicillin

Q193: The majority of human Aspergillus diseases are caused by:

A) A. clavatus and A. flavus
B) A. fumigatus and A. niger
C) A. terreus and A. glaucus
D) A. versicolor and A. sydowii
✅ Correct Answer: B) A. fumigatus and A. niger

Q194: Aspergillus species are:

A) Yeasts
B) Dimorphic fungi
C) Molds with septate hyphae
D) Intracellular fungi
✅ Correct Answer: C) Molds with septate hyphae

Q195: Aspergillus hyphae form branching at:

A) 90° angle (right angle)
B) V-shaped dichotomous branching (45°)
C) Parallel arrangement
D) Spiral pattern
✅ Correct Answer: B) V-shaped dichotomous branching (45°)

Q196: Aspergillus species are identified by:

A) Size only
B) Color only
C) Morphological features + pattern of conidiophore development + color of conidia
D) Type of sexual spores
✅ Correct Answer: C) Morphological features + pattern of conidiophore development + color of conidia

Q197: Aspergillus on SDA at 25°C produces colonies within:

A) 30 minutes
B) 1-2 days (velvety surface)
C) 2 weeks
D) 1 month
✅ Correct Answer: B) 1-2 days (velvety surface)

Q198: Unlike Candida species, Aspergillus species do NOT form part of the normal human flora, therefore transmission is:

A) Endogenous (from within the body)
B) Mostly exogenous (from the environment)
C) From person to person
D) From animals to humans
✅ Correct Answer: B) Mostly exogenous (from the environment)

Q199: In immunocompetent hosts, Aspergillus species primarily affect the lungs causing four main syndromes. Which is NOT one of them?

A) Allergic bronchopulmonary aspergillosis
B) Aspergilloma
C) Invasive aspergillosis
D) Meningitis
✅ Correct Answer: D) Meningitis

Q200: Direct KOH preparation of specimen in Aspergillosis shows:

A) Wide nonseptate hyphae with right angle branching
B) Nonpigmented, septate hyphae with characteristic dichotomous branching at 45°
C) Encapsulated yeast cells
D) Rectangular arthrospores
✅ Correct Answer: B) Nonpigmented, septate hyphae with characteristic dichotomous branching at 45°

Q201: For culture of Aspergillus, SDA is used:

A) With cycloheximide
B) WITHOUT cycloheximide, incubated at 25°C for 1-2 days
C) With blood only
D) With activated charcoal
✅ Correct Answer: B) WITHOUT cycloheximide, incubated at 25°C for 1-2 days

Q202: Estimation of serum galactomannan is useful for diagnosis of:

A) Candidiasis
B) Cryptococcosis
C) Invasive aspergillosis
D) Histoplasmosis
✅ Correct Answer: C) Invasive aspergillosis

Q203: Diagnosis of allergic bronchopulmonary aspergillosis is established by:

A) India ink for CSF
B) Germ tube test
C) Positive skin test for A. fumigatus + highly increased serum IgE (1000 IU/cc)
D) Latex agglutination
✅ Correct Answer: C) Positive skin test for A. fumigatus + highly increased serum IgE (1000 IU/cc)

Q204: Serum IgG levels are usually positive in:

A) Invasive aspergillosis
B) Allergic bronchopulmonary aspergillosis
C) Aspergilloma
D) Chronic necrotizing aspergillus pneumonia
✅ Correct Answer: C) Aspergilloma

Q205: Aspergillus spp. produce toxic metabolites that inhibit:

A) Antibody production
B) Macrophage and neutrophil phagocytosis
C) T cell activity
D) Kidney function
✅ Correct Answer: B) Macrophage and neutrophil phagocytosis

Q206: Zygomycosis is also known as:

A) Histoplasmosis
B) Mucormycosis or Phycomycosis
C) Cryptococcosis
D) Aspergillosis
✅ Correct Answer: B) Mucormycosis or Phycomycosis

Q207: The causative agents of Zygomycosis include:

A) Candida, Aspergillus, Cryptococcus
B) Histoplasma, Blastomyces, Coccidioides
C) Mucor, Rhizopus, and Absidia
D) Sporothrix, Madurella, Piedraia
✅ Correct Answer: C) Mucor, Rhizopus, and Absidia

Q208: The most common causative agent of Zygomycosis in humans is:

A) Rhizopus microsporus
B) Rhizopus arrhizus
C) Rhizopus stolonifer
D) Mucor circinelloides
✅ Correct Answer: B) Rhizopus arrhizus

Q209: Zygomycosis is the _______ most frequent cause of invasive fungal infection in immunocompromised patients:

A) First
B) Second
C) Third
D) Fourth
✅ Correct Answer: C) Third

Q210: Agents of Zygomycosis have a high degree of predilection to invade:

A) Neurons
B) Major blood vessels → leading to ischemia, necrosis, and infarction
C) Connective tissue only
D) Lymph nodes
✅ Correct Answer: B) Major blood vessels → leading to ischemia, necrosis, and infarction

Q211: Agents of Zygomycosis are transmitted by:

A) Skin contact
B) Ingestion of food
C) Air, through their asexual spores
D) Insect vectors
✅ Correct Answer: C) Air, through their asexual spores

Q212: The most common manifestation of Zygomycosis seen in patients with diabetic acidosis is:

A) Pulmonary zygomycosis
B) Gastrointestinal zygomycosis
C) Rhinocerebral zygomycosis
D) Cutaneous zygomycosis
✅ Correct Answer: C) Rhinocerebral zygomycosis

Q213: Most infections produced by Zygomycetes are:

A) Chronic and slowly progressive
B) Acute and usually fatal despite early diagnosis and treatment
C) Self-limiting
D) Mild and localized
✅ Correct Answer: B) Acute and usually fatal despite early diagnosis and treatment

Q214: P. marneffei is characterized by being:

A) The most common Penicillium causing infections
B) The only dimorphic fungus in the genus Penicillium known to cause opportunistic infection
C) A non-dimorphic pathogen
D) A yeast-only organism
✅ Correct Answer: B) The only dimorphic fungus in the genus Penicillium known to cause opportunistic infection

Q215: Culture of P. marneffei should be done in a laboratory with:

A) No special precautions
B) Biohazard safety level-2 precautions
C) Specialized hospital only
D) Standard laboratory
✅ Correct Answer: B) Biohazard safety level-2 precautions

Q216: P. marneffei on SDA without cycloheximide at 25°C produces:

A) Completely white creamy colonies
B) Mycelial grayish white colonies, green center, white periphery, and bright rose pigmented reverse
C) Black shiny colonies
D) Brown-red colonies
✅ Correct Answer: B) Mycelial grayish white colonies, green center, white periphery, and bright rose pigmented reverse

Q217: P. marneffei on SDA at 37°C produces:

A) White mycelial colonies
B) Yeast-like colonies, cream-colored mucoid with brown-red pigment
C) Green colonies
D) Does not grow at 37°C
✅ Correct Answer: B) Yeast-like colonies, cream-colored mucoid with brown-red pigment

Q218: Peripheral blood smear shows P. marneffei in patients with:

A) Normal healthy adults
B) Diabetic patients
C) AIDS patients
D) Hepatitis patients
✅ Correct Answer: C) AIDS patients

Q219: Culture is the gold standard for P. marneffei diagnosis. Which statement is TRUE?

A) It grows slowly requiring 3 months
B) P. marneffei is highly infectious, requiring biohazard safety level-2 precautions
C) It cannot be grown on SDA
D) No safety precautions are needed
✅ Correct Answer: B) P. marneffei is highly infectious, requiring biohazard safety level-2 precautions

Q220: Finding suitable antifungal targets is difficult because:

A) Fungi evolve very rapidly
B) Fungi, like humans, are eukaryotes with similar cellular and molecular processes
C) There are no targets in fungi
D) Fungal cell wall is impermeable to all drugs
✅ Correct Answer: B) Fungi, like humans, are eukaryotes with similar cellular and molecular processes

Q221: Polyenes group of antifungal drugs includes:

A) Fluconazole and Ketoconazole
B) Amphotericin B and Nystatin
C) Griseofulvin and Caspofungin
D) Terbinafine and Naftifine
✅ Correct Answer: B) Amphotericin B and Nystatin

Q222: The mechanism of action of Amphotericin B is:

A) Inhibition of Cytochrome P-450 enzymes
B) Inhibition of DNA synthesis
C) Binding to ergosterol in the fungal cell membrane
D) Inhibition of Beta-glucan synthetase
✅ Correct Answer: C) Binding to ergosterol in the fungal cell membrane

Q223: Azole derivatives include all of the following EXCEPT:

A) Miconazole
B) Fluconazole
C) Amphotericin B
D) Ketoconazole
✅ Correct Answer: C) Amphotericin B

Q224: The mechanism of action of Azole derivatives is:

A) Binding directly to ergosterol
B) Inhibition of Cytochrome P-450 dependent enzymes → disrupting ergosterol synthesis
C) Inhibition of chitin synthesis
D) Inhibition of Beta-glucan synthetase
✅ Correct Answer: B) Inhibition of Cytochrome P-450 dependent enzymes → disrupting ergosterol synthesis

Q225: 5-Fluoro-cytosine (Nucleoside analog) mechanism of action is:

A) Binding to ergosterol
B) Inhibition of Beta-glucan synthetase
C) Inhibition of DNA and RNA synthesis
D) Inhibition of microtubular function
✅ Correct Answer: C) Inhibition of DNA and RNA synthesis

Q226: Griseofulvin mechanism of action is:

A) Binding to ergosterol
B) Inhibition of microtubular function
C) Inhibition of Beta-glucan synthetase
D) Inhibition of RNA polymerase
✅ Correct Answer: B) Inhibition of microtubular function

Q227: Allylamines (Naftifine, Terbinafine) mechanism of action is:

A) Beta-glucan synthetase inhibitors
B) Squalene epoxidase inhibitors
C) Cytochrome P-450 inhibitors
D) Binding to ergosterol directly
✅ Correct Answer: B) Squalene epoxidase inhibitors

Q228: Echinocandins (Caspofungin, Anidulafungin) mechanism of action is:

A) Ergosterol synthesis inhibition
B) Chitin synthesis inhibition
C) B-1,3-glucan synthetase inhibitors
D) DNA synthesis inhibition
✅ Correct Answer: C) B-1,3-glucan synthetase inhibitors

Q229: Morpholines (Amorolfine) mechanism of action is:

A) Binding directly to ergosterol
B) Inhibiting microtubular function
C) Inhibiting ergosterol biosynthesis
D) Inhibiting Beta-glucan synthetase
✅ Correct Answer: C) Inhibiting ergosterol biosynthesis

Q230: Thiocarbamates (Tolnaftate, Tolciclate) mechanism of action is:

A) Inhibiting Cytochrome P-450
B) Squalene epoxidase inhibitors
C) Binding to ergosterol
D) Inhibiting Beta-glucan synthetase
✅ Correct Answer: B) Squalene epoxidase inhibitors

Q231: C. glabrata is characterized by being:

A) More sensitive to Amphotericin B than C. albicans
B) Intrinsically less susceptible to Amphotericin B and other azoles
C) Highly sensitive to Fluconazole
D) Not causing invasive candidiasis
✅ Correct Answer: B) Intrinsically less susceptible to Amphotericin B and other azoles

Q232: Antifungal prophylaxis is indicated for:

A) All hospitalized patients
B) Patients with invasive candidiasis at high risk
C) Healthy outpatients
D) Patients with superficial mycosis
✅ Correct Answer: B) Patients with invasive candidiasis at high risk

Q233: A patient with AIDS presents with meningitis. CSF examination with India ink shows encapsulated yeast with a clear halo. What is the most likely causative organism?

A) Candida albicans
B) Aspergillus fumigatus
C) Cryptococcus neoformans
D) Histoplasma capsulatum
✅ Correct Answer: C) Cryptococcus neoformans

Q234: A culture on SDA at 25°C shows hyphae with tuberculate macroconidia. At 37°C, oval yeast cells are found within macrophages in bone marrow. What is the causative organism?

A) Blastomyces dermatitidis
B) Histoplasma capsulatum
C) Coccidioides immitis
D) Sporothrix schenckii
✅ Correct Answer: B) Histoplasma capsulatum

Q235: A patient from South America has chronic pulmonary disease. KOH 30% preparation of sputum shows large yeasts with multiple buds resembling "steering wheel." What is the causative organism?

A) Blastomyces dermatitidis
B) Cryptococcus neoformans
C) Paracoccidioides brasiliensis
D) Histoplasma capsulatum
✅ Correct Answer: C) Paracoccidioides brasiliensis

Q236: A patient has a swelling on the arm with a draining sinus containing black granules. The most likely diagnosis is:

A) Sporotrichosis
B) Chromoblastomycosis
C) Mycetoma with black grains
D) Rhinosporidiosis
✅ Correct Answer: C) Mycetoma with black grains

Q237: A culture from a skin specimen produces germ tube in human serum within 2 hours at 37°C. This phenomenon is called:

A) Endosporulation phenomenon
B) Reynold-Braude phenomenon
C) Dimorphism phenomenon
D) Blastospore phenomenon
✅ Correct Answer: B) Reynold-Braude phenomenon

Q238: A diabetic patient develops sinusitis with spread to the brain. Microscopy shows wide, nonseptate (coenocytic) hyphae. The most likely causative organism is:

A) Aspergillus fumigatus
B) Candida albicans
C) Rhizopus species (Zygomycosis)
D) Cryptococcus neoformans
✅ Correct Answer: C) Rhizopus species (Zygomycosis)

Q239: A culture from a patient suspected of having Valley fever (Coccidioidomycosis) shows white cottony colonies on SDA within 5 days with arthroconidia. What precaution must be taken?

A) No special precautions needed
B) Handle with extreme caution as arthroconidia are infectious and pose significant risk to laboratory personnel
C) Gloves only are sufficient
D) Petri dishes can be opened in a regular laboratory
✅ Correct Answer: B) Handle with extreme caution as arthroconidia are infectious and pose significant risk to laboratory personnel

Q240: A patient on corticosteroid therapy develops pulmonary infection. KOH preparation shows septate hyphae with dichotomous branching at 45°. The most likely causative organism is:

A) Candida albicans
B) Aspergillus fumigatus
C) Cryptococcus neoformans
D) Mucor
✅ Correct Answer: B) Aspergillus fumigatus

Q241: A gardener develops a painless nodule on the hand that progresses up the lymphatics. Pus examination shows asteroid bodies. The diagnosis is:

A) Blastomycosis
B) Sporotrichosis
C) Chromoblastomycosis
D) Mycetoma
✅ Correct Answer: B) Sporotrichosis

Q242: Which of the following correctly matches the superficial mycosis with its causative organism?

A) Pityriasis versicolor → Piedraia hortae
B) Black piedra → Trichosporon beigelli
C) White piedra → Trichosporon beigelli
D) Tinea nigra → Malassezia furfur
✅ Correct Answer: C) White piedra → Trichosporon beigelli

Q243: A drug that targets ergosterol in the fungal membrane would be INEFFECTIVE against bacteria because:

A) Bacteria have chitin instead
B) Bacteria lack ergosterol; they have different sterols (absent except in Mycoplasma)
C) Bacteria are prokaryotes with no membrane
D) Bacteria produce beta-glucan
✅ Correct Answer: B) Bacteria lack ergosterol; they have different sterols (absent except in Mycoplasma)

Q244: Which antifungal drug works by inhibiting B-1,3-glucan synthetase, thereby disrupting the fungal cell wall?

A) Amphotericin B
B) Fluconazole
C) Caspofungin
D) Griseofulvin
✅ Correct Answer: C) Caspofungin

Q245: A patient with AIDS has a skin lesion. Histopathological examination shows yeast cells with transverse septa. What is the most likely organism?

A) Candida

albicans
B) Aspergillus fumigatus
C) Penicillium marneffei
D) Cryptococcus neoformans
✅ Correct Answer: C) Penicillium marneffei

🔺 رابط بداية الاختبار الشاملة لمادة الفطريات

🔺 شباب شاركو بكروباتكم

https://t.me/Lab3ST/372

🔺 بشرو طلاب ؟

🔺المراجعة المركزة والامتحان الشامل شلونهن ؟

🔺 موفقين إن شاء الله بالأمتحانات وبحياتكم كلها

🔺احتفضو بالقناة إن شاء الله الشروحات الي راح تجي تكون افضل وافضل واسهل بقوة الله ..

🔺بعد الامتحانات اكو أشياء انزلها ممكن تفيدكم بالدراسة وخارج الدراسة للي يحب يستغل العطلة إن شاء الله ..

🔺 عيدكم مبارك إن شاء الله ينعاد عليكم بخير وعافية ونجاح

🔺ارتاحو هاي الفتره محضرين أشياء كلش مفيده الكم إن شاء الله تستثمرون العطله بيها بأقصى فائدة 🤝

MCV = Mean Corpuscular Volume
🔺 يعني يعبر عن حجم كريات الدم الحمراء (هل هي صغيرة أم كبيرة؟).

​RDW = Red Cell Distribution Width
🔺 يعني يعبر عن مدى الاختلاف والتفاوت بأحجام الكريات الحمراء (يعني الخلايا كلها نفس الحجم لو صايرة أحجام مشكلة؟).

​📉 الفرق بفقر الدم الناتج عن نقص الحديد (IDA):
التغيير بالحجم يبدي بالتدريج وبشكل عشوائي في النخاع، فتطلع عينات دم أحجامها مختلفة ومخربطة (وحدة كبيرة ووحدة صغيرة)، لذلك نشوف الـ RDW صاعد (مرتفع).

​🧬 أما في حالة الثلاسيميا (Thalassemia Trait):
هذا خلل جيني وراثي ثابت، يعني النخاع من الأساس وبشكل منتظم يصنع خلايا كلها صغيرة وبنفس الحجم تقريباً (متجانسة)، لذلك نشوف الـ RDW طبيعي (Normal).

🔶 معلومات مهمه ومفيده بالجانب العملي نتعلمها سوه بالأضافه لأشياء مفيده أكثر بالمستقبل إن شاء الله

https://t.me/Lab3ST

السلام عليكم

🔺 هاي العطلة إن شاء الله نستثمرها سوه بدراسة كل التحاليل الي نحتاجها وبكل تفاصيلها وبطريقة مبسطة وعلمية إن شاء الله 🤝

🔺مع الإلتزام ويانه راح تكدرون تعرفون
📌شلون نسوي التحاليل
📌شلون نقراها ونشخص من خلالها
📌الأشياء الي تداخل وتخلي النتيجة خطأ

🔶كيسات على كل الحالات بحيث من تكملون انتو مضبطين التحاليل وتقروها وتعرفون شلون يسوونها بالمختبر إن شاء الله

🔶احب آخذ رأيكم 🤝

السلام عليكم

أشارك وياكم موضوع مهم بخصوص حياتكم من هسه وإلى بعد التخرج اتمنى تستفادون منه وحاولوا تقرون الرساله أكثر من مره حتى توضح الصورة وتعرفون الصعوبات والحلول بواقعية ومايضيع الوقت بدون فائدة إن شاء الله

🔺 تعرفون وضع التعيينات حاليا مو زينه وماأحد يكدر يعتمد عليها لأن ممكن تتأخر فد ٥ سنين على الأقل

🔺صح تعبتو وأكيد الله مايضيع تعب أحد بس لازم تتعاملون وي الوضع بواقعيه وتأدون إلي عليكم بأفضل صورة حتى ترتاحون وماتحسون مقصرين بحق نفسكم والحل راح يكون كالآتي :

🔶 انتو تعبتو اقل شي ١٦ سنه حتى    تحصلون هذي الشهادة وبعد صرتو معروفين انو أنتم محللين صح فرص العمل مو كلش هواي بس إلي عليكم تضبطون أساسيات العمل حتى بأي فرصه متاحه تكدر تنافس عليها وماتروح منك بسبب تأخرك بمجالك العملي لأن تعرفون دراسة الكلية فقط مو كافية للعمل بالواقع 

🔶وهم انتو  تنسألون بالبيت وبالشارع وبأي مكان عن إختصاصكم يوم واحد يكلك اقرالي هذا التحليل ويوم أحد يكلك عندي هاي أعراض شنو اسوي تحليل فلازم تضبطون أسياسيات إختصاصكم حتى تنافسون على اقرب فرصه ممكن تحصلوها وأيضا عدكم الخبره الكافية حتى تردون على أي تساؤل إلكم أو اهلكم أو اصدقائكم بدون احراج

📌 هذا الجانب الأول الي إن شاء الله راح نساعدكم بي فقط اريد تلتزمون ويانه خلال الفتره الجايه وبعد كم يوم راح ننزل كل التفاصيل ونبدي نضبط التحاليل المطلوبة منكم بهذا المستوى  وتفاصيلها نظريا وعمليا  وتكدرون بسهولة تتعاملون وياها إن شاء الله

🔺 بعد مانضبط مجال التحاليل اكو حلول ثانيه وتأكدو الله مايضيع تعب أحد علينا بس نمشي بالاسباب خطوه بخطوه 🤲

(وَ ما مِنْ دَابَّةٍ فِي الْأَرْضِ إِلاَّ عَلَى اللَّـهِ رِزْقُها وَ يَعْلَمُ مُسْتَقَرَّها وَ مُسْتَوْدَعَها كُلٌّ فِي كِتابٍ مُبِين)

🔺مرحبا جاهزين ؟
رايح ينزل فيديو على اليوتوب بي تفاصيل دراسة التحاليل للفتره الجاية إن شاء الله 🤝

🔺جزء من شرح تحليل CBC