Blastomycosis

Blastomycosis

Q. 1

Blastomycosis is characterized by all except ‑

 A

Yeast like fungus

 B

Commonly involves lung and skin

 C

Dimorphic fungus

 D

Common in South America

Q. 1

Blastomycosis is characterized by all except ‑

 A

Yeast like fungus

 B

Commonly involves lung and skin

 C

Dimorphic fungus

 D

Common in South America

Ans. D

Explanation:

Ans. is ‘d’ i.e., Common in South America

Blastomycosis

This is a chronic infection caused by Blastomyces dermatitidis.

. B. dermatitidis is a dimorphic fungus that grows at room temeperature as a white or tan mould but grow within host or at 37°C as budding, round yeast like cells.

.  Infection is largely confined to the North American continent –> “North American blastomycosis”.

.  .  It is characterized by formation of suppurative and granulontatous lesion in any part of the body but with a marked predilection for the lung and skin.

.   


Q. 2

Dimorphic fungi are all except –

 A

Coccidioidomycosis

 B

Blastomycosis

 C

Candida

 D

None

Q. 2

Dimorphic fungi are all except –

 A

Coccidioidomycosis

 B

Blastomycosis

 C

Candida

 D

None

Ans. D

Explanation:

Ans. is None

  • All are dimorphic fungi

Q. 3

NOT a cause of community acquired pneumonia:

March 2013

 A

Streptococcus pneumoniae

 B

Mycoplasma pneumoniae

 C

Moraxella catarrhalis

 D

Blastomyces

Q. 3

NOT a cause of community acquired pneumonia:

March 2013

 A

Streptococcus pneumoniae

 B

Mycoplasma pneumoniae

 C

Moraxella catarrhalis

 D

Blastomyces

Ans. D

Explanation:

Ans. D i.e. Blastomyces

Blastomyces dermatitidis causes chronic (granulomatous) pneumonia


Q. 4

All of the following causes subcutaneous fungal infections except:

September 2007

 A

Blastomycosis

 B

Sporotrichosis

 C

Maduramycosis

 D

Rhinosporodiosis

Q. 4

All of the following causes subcutaneous fungal infections except:

September 2007

 A

Blastomycosis

 B

Sporotrichosis

 C

Maduramycosis

 D

Rhinosporodiosis

Ans. A

Explanation:

Ans. A: Blastomycosis

A. Superficial mycoses

These affect the outer layers of the skin, the nails and hair. The main groups of fungi causing superficial fungal infections are:

–          Dermatophytes-Trichophyton, Microsporum and epidermophyton

–          Yeasts i.e. candida, malassezia, piedra

–          Moulds.

B. Deep mycoses

Subcutaneous mycoses

These involve the deeper layers of the skin (the dermis, subcutaneous tissue and even bone). The causative organisms normally live in the soil living on rotting vegetation. They can get pricked into the skin as a result of an injury but usually stay localised at the site of implantation. Deeper skin infections include:

–          Mycotic mycetoma

–          Chromoblastomycosis

–          Sporotrichosis

–          Rhinosporodiosis

Systemic fungal infections

Systemic mycoses may result from breathing in the spores of fungi, which normally live in the soil or rotting vegetation or as opportunistic disease in immune compromised individuals.The result is most often a mild infection and long lasting resistance to further attack, but occasionally these infections are more serious and chronic (especially in the immune suppressed). The organisms causing systemic fungal infections include:

–          Histoplasmosis

–          Coccidioidomycosis

–          Cryptococcosis

–          Blastomycosis

–          Paracoccidioidomycosis



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