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DTMH Laboratory > Vectors And Diseases > Flashcards

Vectors And Diseases Flashcards

1
Q

Rickettsia Typhi
Vector?
Disease?

A

Vector - Pulex flea
Disease - Endemic murine typhus

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2
Q

Rickettsia Rickettsi
Rickettsia Africanus
Rickettsia Coroni
are all forms of which disease?
Vector?

A

Disease - Spotted Fevers (tick typhus)
Vector - Hard ticks

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3
Q

Borrelia Recurentis
Vector?
Disease?

A

Disease - epidemic louse borne relapsing fever
Vector - body louse

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4
Q

Borrelia Duttoni
Vector?
Disease?

A

Vector - Soft ticks
Disease - endemic tick-borne relapsing fever

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5
Q

Borrelia Borgderferi
Vector?
Disease?

A

Vector - hard (ixodie) tick
Disease - Lyme’s Disease

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6
Q

Orientia tsutsugamushi
Disease?
Vector?

A

Disease - Scrub Typhus
Vector - Chigger mite (trombidium)

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7
Q

Coxiella Bornetti
Which disease?
Vector?

A
  • Q Fever
  • spread by ticks to animals, but humans usually get it from inhaling dust contaminated with infected animal products

Direct OR Indirect contact with infected animal products, ie breathing in dust that has been contaminated by infected animal feces, urine, milk etc

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8
Q

Rickettsia Prawazekii
Disease?
Vector?

A

Disease - Epidemic Typhus
Vector - Body louse

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9
Q

Loa Loa is spread by

A
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10
Q

Mansonella perstans is spread by

A
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11
Q

Onchocerciasis is spread by

A

Simulium

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12
Q

What are these the eggs/larvae of?

A

Black fly (simulium)

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13
Q

What is this?

A

Culex mosquito

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14
Q

What is this?

A

Anopheles mosquito

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15
Q

What is this?

A

Mansonia mosquito

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16
Q

What is this?

A

Aedes mosquito

(Aedes aegyptii due to the lyre pattern - albopictus has a single white stripe down it)

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17
Q

What is this?

A

Anopheles larva

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18
Q

What is this?

A

Culex larva

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19
Q

What is this?

A

Aedes larva

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20
Q

What is this?

A

Mansonia larva

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21
Q

What is this?

A

Culex eggs

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22
Q

What is this?

A

Anopheles eggs

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23
Q

What is this?

A

Aedes eggs

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24
Q

What is this?

A

Mansonia eggs

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25
Q

What species does this show?

A

Anopheles

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26
Q

What species does this show?

A

Culex

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27
Q

What is this?

A

Wuchereria bancrofti microfilaria

Nuclei:
- stain purple and are sharply defined
- do not extend all the way to the tip of the tail

Sheath
- stained a paler colour

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28
Q

What is this?

A

Brugia microfilaria

Nucelus:
- 2 discrete sub termina nuclui
- gap between terminal nuclei

Sheath
- pink stained

usually ‘kinked’ and tail is tapered

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29
Q

What is this?

A

Loa Loa microfilaria

vector - chrysops

Sheathed
Nuclei extend to tip of the tail (often bent to one side)

30
Q

What is this?

A

Mansonella perstans microfilaria

unsheathed
smaller than other microfilariae
blunt tail
nuclei extend to tip of the tail

31
Q

What fly does this wing belong to?

A

Tsetse fly

32
Q

What fly do these pictures show?

A

Tsetse fly

33
Q

What is this?

A

Brucei trypanosome

pleomorphic with a small kinetoplast located at the posterior end with a centrally placed nucleus, a free flagellum leaves the body at the anterior end.

34
Q

What does this show?

A

Brucei trypanosome in CSF

35
Q

What does this show?

A

Brucei trypanosome in lymph node aspirate

36
Q

What does this show?

A

T. cruzi - amastigote form in ‘pseudocysts’ in smooth muscle

37
Q

What is this?

A

Brucei trypanosomes in blood

divides in blood

38
Q

What is this?

A

T. Cruzi trypanosome in blood

divides in smooth muscle

39
Q

What is this?

A

Phlebotomine Sandfly

40
Q

What is seen here?

A

amastigotes of Leishmania in a spleen biopsy sample

41
Q

What are these?

A

Intracellular leishmania amastigotes

42
Q

What are these?

A

Extracellular leishmania amastigotes

43
Q

What fly do these pictures show?

A

Musca domestica (houseflies)

44
Q

What is this?

A

Stomoxys (Stable fly)

45
Q

Which are the obligatory myaiasis flies?

This means they live on the host for part of their lifecycle

A
  • Tumbu flies
  • Bot flies
  • Screw-worms
46
Q

Which are the facultative myaiasis flies?

Normally free-living flies but infest living tissue in existing wounds

A
  • blowflies
  • some fleshflies
47
Q

What is this?

A

Screw-worm larvae

Larvae of Chrysomya and Cochliomyia flies

They invade natural orifices, nose, mouth, eyes, vagina resulting in serious tissue destruction and severe pain

48
Q

What is this?

A

Cordylobia larva

Cordylobia have smaller spines or spicules over the dorsal surface

a cause of furuncular myiasis

Cordylobia adults lay eggs on clothes spread out for drying or in dirty soil. The larvae develop in 24-48 hours and penetrate the skin from wearing the clothes.

49
Q

What is this?

A

Dermatobia larvae

Dermatobia with hooks on each segment.

Dermatobia are the larvae of the human bot-fly.
Eggs are laid onto other insects ie mosquitoes, larvae enter skin through wound made by mosquito when it bites a human

50
Q

What fly are these from?

A

Tsetse fly (glossina)

51
Q

What is this?

A

Non-metallic blowfly (Sarcophagidae)

thorax has three longitudinal stripes

commonly known as a flesh-fly

52
Q

What is this?

A

Calliphora (blue bottle fly)

feed on dead tissue
usually no serious consequences since they feed on pus and necrotic tissue

53
Q

What is this?

A

Lucilia (green bottle fly)

54
Q

What is this?

A

Tsetse fly (glossina) larvae

55
Q

What are these?

A

differing stages of Tsetse fly (glossina) pupae

56
Q

What infective stage of parasite does this bug transmit to humans through its faeces

It defecates soon after biting; that’s how the parasite enters the body

A

Infective metacyclic trypanosomes

57
Q

What is this?

A

Phlebotomine sandfly

58
Q

What is this?

A

Bed bug (Cimex)

59
Q

What is this?

A

Bedbug - head and mouthparts

60
Q

What is this?

A

Hard tick

Unfed female

61
Q

What is this?

A

Hard tick

fed female

62
Q

Humans are more often parasatised by which life stage of a hard tick?

A

Larvae and nymphs

63
Q

What bacteria do these vectors transmit?

A

Soft ticks transmit Borrelia duttonii

Tick-borne (endemic) relapsing fever

64
Q

What bacteria do these vectors transmit?

A

Chigger mites transmitOrientia tsutsugamushi

Scrub Typhus

65
Q

What disease do these vectors transmit?

A

Scabies

66
Q

What diseases does this flea transmit

A

Xenopsylla transmits yersinia pestis, plague

no combs, meral rod on 2nd thoracic segment

67
Q

What disease does this flea transmit?

A

Pulex transmits rickettsia typhi (murine typhus)

no combs, no meral rod

68
Q

What is this and what problem does it cause?

A

Tunga penetrans (jigger flea)
burrows under toenails causing itching, pain and inflammation

69
Q

What is this?

A

Body louse

70
Q

What diseases do these cause?

A

Body lice cause:
* epidemic typhus (rickettsia prowazecki)
* epidemic relapsing fever (borrelia recurrentis)

DTMH Laboratory (8 decks)

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