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Tropical medicine - All clinical images copyright Gorgas course - : Instituto de Medicina Tropical Alexander von Humboldt > Parasitology gorgas EXTRAS > Flashcards

Parasitology gorgas EXTRAS Flashcards

1
Q

Soil transmitted helminths pneumonic? Common names of each

A

A2NTS

Ascaris lumbricoides - Giant roundworm = Ascariasis

Ancylostoma duodenale/Necator americanusHookworms - Hookworm infection

Trichuris trichiura - Whipworm - Trichuriasis

Strongyloides stercoralis - Threadworm - Strongyloidiasis

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2
Q

Which of the soil-transmitted helminths affects large intestine ? All others ar Small intestine

A

Trichuris trichiura - Whipworm

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3
Q

What magnification for microfilaria

A

10x
[40x for identifying which nucleus]

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4
Q

Thick or thin which one do you fix?

A

Thin

When dip in hypotonic stain it would lyse blood cells.
[Need this in thick fil

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5
Q

What are cestodes and trematodes called

A

Platyhelminthes

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6
Q

Difference between a definitive and intermediate host

A

Definitive- the parasite reproduces sexually and/or harbors the adult stage

Intermediate - the parasite reproduces asexually and/or harbors the larval stage

Some parasites have 2 intermediate hosts.

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7
Q

Paratenic host?

A

Paratenic - The parasite lives but can’t develop further, Eg not essential

Functions as a transport or carrier host

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8
Q

What are the diagnostic stage of all filarial bois

A

L1

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9
Q

What is a rhabditiform vs a filariform larva? How to tell difference in strongy?

A

rhabditiform - L1/2 - Oesophagus is joined to a terminal oesophageal bulb by a narrow isthmus
filariform - Elongated and cylindrical oesophagus with no terminal bulb

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10
Q

How much blood for thick stain

A

50uL

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11
Q

What is oviparous? Which organisms are like this?

A

Eggs take time to hatch in environment
-Most intestinal nematodes (bar strongyloides)
[Dx eggs in stool]

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12
Q

What is viviparous? Which organisms are like this?

A

Directly give birth to larva Eg no eggs
-Tissue nematodes (filarial, Trichinella, dracunculus)
[Dx larvae in tissue/blood]

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13
Q

What is ovoviviparous? Which organisms are like this?

A

Females lay eggs which immediately hatch
-Strongyloides
[Dx Larva in stool]

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14
Q

Lifecycle of most nematodes has how many hosts? Which are exceptions

A

Complete lifecycle with only 1 host [human]
Exemptions:

filarial worms
- Def - Humans
- Intermediate - mosquito/fly

Dracunculus medinensis
- Def Humans
- Intermediate - cyclops flea

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15
Q

Which Todes are segmented

A

cestodes

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16
Q

Why saginata more motile than solium

A

Need to get out of poo so cows eat them
Pigs don’t mind eating poo

17
Q

How to conform an amastigote on microscopy

A

Has kinetoplast (small dot next to nucleus)
Often both within and outwith macrophage

Tropical medicine - All clinical images copyright Gorgas course - : Instituto de Medicina Tropical Alexander von Humboldt (26 decks)

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