Visuals in the lab: Recognizing infectious organisms Flashcards by Natalie M

Q

What organism is this?

A

Taenid egg.

(e.g. Taenia spp., Echinococcus spp.)

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Q

What organism is this?

A

Ascaris lumbricoides egg.

Left: fertilized

Right: unfertilized

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Q

What organism is this?

A

Hymenolepis nana egg.

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Q

What organism is this?

A

Enterobius vermicularis egg.

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Q

What organism is this?

A

Dibothriocephalus latus egg.

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Q

What organism is this?

A

Hookworm egg.

(Ancylostoma spp., Necator spp.)

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Q

What organism is this?

A

Trichostrongylus egg.

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Q

What organism is this?

A

Paragonimus egg.

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Q

What organism is this?

A

Capillaria egg.

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Q

What organism is this?

A

Dipylidium caninum egg.

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Q

What organisms are these?

A

Fasciolopsis & Fasciola eggs.

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Q

What organisms are these, from left to right?

A

Schistosoma eggs.

S.japonicum*
S.mekongi*
S.haematobium*
S.intercalatum*
S.mansoni*

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Q

What organism is this?

A

Trichuris trichiuris egg.

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Q

What organisms are these?

A

Opisthorchis & Clonorchis eggs.

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Q

What organisms are these?

Which stage of the life cycle is shown?

A

Strongyloides stercoralis & hookworm larvae.

Left set: rhabditiform larvae.

Right set: filariform larvae.

Left-to-right: Strongy, hookworm, hookworm, Strongy

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Q

What organism is this?

A

Dibothrocephalus latus proglottid & scolex.

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Q

What organism is this?

A

Dipylidium caninum proglottid & scolex.

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Q

What organism is this?

A

Hymenolepis nana proglottid & scolex.

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Q

What organism is this?

A

Taenia saginata proglottid & scolex.

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Q

What organism is this?

A

Taenia solium proglottid & scolex.

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Q

What organism is this?

A

Curvularia

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Q

What organism is this?

A

Alternaria

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Q

What organism is this?

A

Blastomyces dermatitidis

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Q

What organism is this?

A

Coccidioides (C.immitis or C.posadasii)

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What organism is this?

***Blastomyces dermatitidis***

What organism is this?

***Histoplasma capsulatum***

What organism is this?

***Histoplasma capsulatum***

What organism is this?

***Coccidioides***

What organism is this?

***Paracoccidioides brasiliensis***

What organism is this?

***Blastomyces dermatitidis***

What organism is this?

***Aspergillus fumigatus***

What organisms are these?

***Epidermophyton, Microsporum, Trichophyton*** (left to right)

What organism is this?

***Trichophyton mentagrophytes*** * Spiral hyphae * Penci-shaped macroconidia (rarely seen)

What organism is this?

***Trichophyton rubrum*** * Birds-on-a-wire hyphae * Cigar-shaped macroconidia * (Colony back usually reddish)

What organism is this?

***Microsporum canis*** * Snout on macroconidia

What organism is this?

***Malbranchea***

What organism is this?

***Sepedonium*** & ***Chrysosporium tuberculatum*** | (*Histoplasma* lookalikes)

What organism is this?

***Fonsecaea***

What organism is this?

***Chrysosporium keratinophilum*** | (*Blastomyces* lookalike)

What organism is this?

***Fusarium***

What organism is this?

***Rhizopus***

What organism is this?

***Scedosporium***

What organism is this?

***Lomentospora prolificans***

What organism is this?

***Cokeromyces***

What organism is this?

***Aspergillus versicolor***

When a colony appears **grey** on a **BAP**, what organism does this suggest?

Coliform

When a colony appears **dry & pink** on a **MAC** plate, what organism does this suggest?

*E. coli* (but non-specific)

When a colony appears as a **fine green** colony on a **BAP**, what organism does this suggest?

VGS

When a colony appears as a **white opaque** colony on a **BAP**, what organism does this suggest?

CoNS

When a colony appears as a **small grey** colony on a **BAP**, what organism does this suggest?

*Enterococcus faecalis* Most strains are non-hemolytic or α-hemolytic 5% of enterococci can be ß-hemolytic

When a colony appears as a **pink mucoid** colony on a **MAC** plate, what organism does this suggest?

*Klebsiella pneumoniae* (non-specific)

When a colony appears as a **small translucent** colony on a **BAP**, what organism does this suggest?

Diptheroids (Corynebacterium). Can also appear as white opaque colonies.

What organism is this?

*Talaromyces marneffei* (Note the transverse septum)

What organism is this?

*Paracoccidioides*

What organism is this?

A Mucorales fungus

What organism is this?

A Mucorales fungus

Shown is a **mucicarmine**-stained tissue. (inset: Fontana-Masson) What organism is this?

*Cryptococcus*

What organism is this?

A *Candida* spp. producing pseudohyphae

What organism is this?

*Aspergillus* | (Could be any **hyaline** mould)

What organism is this?

*Fusarium* | (Could be any **hyaline** mould)

What organism is this?

*Pneumocystis*

What organism is this?

This could be any **dematiaceous** mould | (Note the pigment-producing hyphae)

What organism is this? | (GMS stain)

*Actinomyces*

What organism is this? | (Gram stain)

*Actinomyces*

What organism is this? | (Gram stain)

*Nocardia*

What organism is this? | (Gram stain)

*Nocardia*

What organism is this? | (Gram stain)

*Clostridium tetani*

What organism is this? | (Gram stain)

*Nocardia*

What organism might this be? How can you tell?

***Malassezia furfur*** Gives the "spaghetti and hollow meatballs" look: * BROKEN mycelia * Large spherical budding yeast with a ring around them