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PARA > Medical Entomology > Flashcards

Medical Entomology Flashcards

1
Q

What mechanical vector (MV) causes Myiasis?

A

Flesh fly (Sarcophaga)
=>chessboard apperance on abdomen

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2
Q

What mechanical vector has metallic blue-green or golden wings?

A

Green-bottle fly (Lucilia serratica)

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3
Q

What mechanical vector has white bordered eyes with dark body & legs & lays its eggs in decayed veggies & animal excrement?

A

Latrine fly (Fannia)

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4
Q

What mechanical vector has sponging mouthparts, hair body & appendages?

A

Housefly (Musca Domestica)

  • females mate only 1x in lifetime

Wing venetiation with vein (V4) bending sharply at end of V3 close to edfe of wing

Red compound eyes

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5
Q

What is the vector of Trypanosoma cruzi, its feeding time, & disease?

A

Triatoma, Panstrongylus or Rhodnius bug
- Cone nose bug (cone shaped nose)
- Assassin bug (feeds in the night)
- Kissing bug (feeds on the face of man)

Chagas disease (Romanas sign)

American Trypanosomiasis

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6
Q

What are the hard ticks that are vectors of Francisella tularensis & Rickettsia rickettsii?

A

Dermacentor variabilis

Feeding: females feed on a long period of time (all stages)

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7
Q

What is the effect of Ixodes tick if it bites a host?

A

LMN paralysis in man & dogs due to secretion of neurotoxin

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8
Q

What are the pathogens carried by Family Argasid?

A

Borrelia duttoni -> relapsing fever
Coxiella brunetti -> Q fever
Rickettsia rickettsi -> RMSF

Has cuticle (rough, wrinkled with fine tubercle)

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9
Q

Hw do u remove ticks?

A

Castor oil, medicinal paraffin, vaseline, nail varnish
DO NOT SQUEEZE the body (use tweezers)

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10
Q

What are the general appearance of lice?

A

Male: small, pointed ends
Female: bigger, has groove
All feed from blood except nits/ova

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11
Q

What are the diff pathogens carried by lice?

A

Borrelia recurrentis**: epidemic relapsing fever (Pediculus humanus corporis)
**Borrelia hermsii: Endemic relapsing fever (Ornithodoros)
*BOrrelia burgdorferi & garinii: Lyme disease, Ixodes scapularis

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12
Q

What are tx used for lice?

A

Eurax
Benzoped soln
1% yellow oxide of mercury ointment

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13
Q

What are hte 3 lice?

A

Pthirus pubis = crab louse (direct injury only), ONLY PARASITIZES a man

Pediculus humanus capitis = head lous

Pediciulus humanus coporis = body louse

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14
Q

What is the morphology of Pthirus pubis?

A

Crab-like body
3 pairs of legs
- 1st pair: holds skin for feeding
- 2nd & 3rd pair: holds hair

MOT: sexual contact

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15
Q

What ar the 4 mites?

A

*Sarcoptes scaibei hominis = scabies (galis aso)
*Trombiculidae = chigger mites
*Demodex folliculorum = follicular mites (present with black heads when squeezed out)
*Dermatophagoides spp = house dust mite

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16
Q

What mite can infect AIDS px?what is its MOT, female, tx & diagnosis?

A

Sarcoptes scaibei hominis
Norweigan scabies/Crusted rabies (severe form)
Females: burrows under host’s skin

“Pepper dot” appearance of eggs

Seen between fingers & on the wrist, elbows, waist, breast, knees

Tropical Permethrin (neckdown), Oral ivermectin, Eurax with hydrocortisone

Use hot soapy water -> diest at 50C for 10 mins (sterlize clothing & bedding)

17
Q

What is the pathogen carried by Trombiculidae or chiger mites?

A

Scrub typhus (orientia tsutsugamushi)

18
Q

What are the apperance of Anopehes & Aedes mosquitos, Culex & Mansonia?

A

Eggs laid singly (Aedes & Anopheles)
*Anopheles = w/ floats (boat like)
* Aedes = w/o floats (resistatn to drying

Eggs laid in groups (Culex & Mansonia)
*Culex = rafts with coolla
*Mansonia = clusters under LEAVES of water plants

19
Q

What are the appearnce of larva of Mosquitos?

A

*w/o Siphon = Anopheles
*w/ Siphon =
-> Aedes 1 pair subventral tuft or hair
-> Culex: several pairs subventral tuft of hair
-> Mansonia: w/ saw-like teeth

20
Q

What aer the diseases transmitted by Culex spp?

A

Japanese encephalitis
Bacroftian filariasis
West nile fever

21
Q

What are the diseases transmitteed by Aedes spp?

A

Yellow fever
Dengue fever
Chikungunya
Yellow fever
Zika virus

22
Q

What are night biters/feeders?

A

Anopheles
Culez
Sandfly
Kissing bug
Sarcoptes scaibei

23
Q

How do u describe Aedes mosquito?

A

*White stripes on black body
*abdomen points at its tip
* light & dark scales on abdomen & thorax
*legs with white basal band

24
Q

what is the vector of Oncocerca volvolus?

A

Mansonia spp

PARA (3 decks)

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