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Micro Final (Lauren, Shelby, and Annie) > Ectoparasitic Infections 🦟 > Flashcards

Ectoparasitic Infections 🦟 Flashcards

1
Q

What is the incubation period for Crusted (Norwegian) Scabies

A

one month!

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2
Q

Scabies infection first time = itchy in ____ (timeframe)

Scabies infection reinfection = itching in _____(timeframe)

A

first time = weeks to develop

reinfection = 24 hours

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3
Q

Flea bite or scabies??

concentrated in the lower extremities like feet, legs

A

flea bites

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4
Q

How is pubic lice transmitted

A

sexual contact

contaminated bedding

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5
Q

Symptoms of Rocky Mountain spotted fever

A

2-14 days after tick bite

SUDDEN ONSET of fever and headache*
RASH* (2 types)

N/V, abd pain, lack of appetite, etc.

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6
Q

How does Pulex irritans (human flea) attach to the host

A

short spike on legs allow attachment

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7
Q

Phthirus pubis - the nits can be found _____ and the adults can be found ______

A

nits = cemented to hair

adults = bite and feed in pubic area

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8
Q

Rickettsia rickettsii =

gram (+/-)
motile?
shape?
type of pathogen?

A

gram negative

non-motile

pleomorphic

OBLIGATE INTRACELLULAR***

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9
Q

What is the species for pubic lice “crabs”

A

Phthirus pubis

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10
Q

Flea bite or scabies??

raised bumps or halo surrounding the actual bite site

A

flea bites

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11
Q

What are the two types of rash in rocky mountain spotted fever

A
  1. small flat PINK non itchy spots on wrists, forearms, and ankles that spreads to trunk, Palms* and Soles* (2-5 days after infection).
  2. RED to purple spotted petechial rash, pinpoint hemorrhages.Sign of late and severe disease(6 days after infection)
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12
Q

Where do female Sarcoptes scabiei go on the skin?

Where do male Sarcoptes scabiei go on the skin?

A

female = burrows into epidermis, 5 week life span, dies in burrow

male = remains on skin surface/ or shallow burrow

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13
Q

How do identify scabies

A

apply mineral oil

scrape lesion

visualize microscopically - look for whole mites or mite parts, eggs or fecal pellets in burrows

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14
Q

What is “vagabond’s disease”

A

years of infestation of pediculus humanus

bite irritation - blood sucking parasite

darkened, thickened skin

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15
Q

What type of scabies is often seen in HIV patients

A

Crusted (Norwegian) Scabies

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16
Q

Burrowing mite that is the most serious of the mites

A

Sarcoptes scabiei

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17
Q

What are the 3 ticks that are arthropod vectors for rocky mountain spotted fever (Rickettsia rickettsii)

A

American dog tick

Rocky mountain wood tick

Brown dog tick

18
Q

What is the life cycle of Sarcoptes scabiei

A

eggs laid under the skin

larva emerges from the eggs after 5 days of incubation

adult mite develops 2 weeks after hatching

19
Q

intensely pruritic eruption that is worse at night

A

Sarcoptes scabiei

20
Q

Flea bite or scabies??

pimple like rash that leads to intense itching at night

A

scabies

21
Q

“small mite with short legs” **

A

Sarcoptes scabiei

22
Q

Flea bite or scabies??

do not live on humans- prefer pet hair

A

flea bites

23
Q

ectoparasite bigger than Sarcoptes scabiei with LONG LEGS*

A

Phthirus pubis

24
Q

What type of scabies is similar to Crusted (Norwegian) Scabies but lesions are BLOOD-FILLED

A

pediatric scabies

25
Q

Flea bite or scabies??

can spread from skin-to skin contact

A

scabies

26
Q

Flea bite or scabies??

can occur anywhere on the body including the web of the skin between fingers and toes, folds of the wrists, on the waist, under the breasts or genitals

A

scabies

27
Q

Flea bite or scabies??

not contagious

A

flea bites

28
Q

Flea bite or scabies??

capable of jumping long distances

A

flea bites

29
Q

Flea bite or scabies??

appear in a tunnel or burrow like rash beneath the skin

A

scabies

30
Q

How does Rickettsia Rickettsii infect the body?

A

painless bite

invades ENDOTHELIAL CELLS THAT LINE BLOOD VESSELS*******

31
Q

Flea bite or scabies??

live on human skin and even lay eggs beneath it

A

scabies

32
Q

Flea bite or scabies??

cannot jump nor fly. crawl very slowly

A

scabies

33
Q

What is the gold standard for diagnosing Rickettsia Rickettsii

A

indirect immunofluorescence with a R. rickettsii antigen

2 samples 2-4 weeks apart

(dx tests are not good! most dx is clinical!)

34
Q

Flea bite or scabies??

groups of three or four, generally in a LINEAR pattern

A

flea bites

35
Q

Flea bite or scabies??

anyone can get bites

A

flea bites

36
Q

How is scabies transmitted?

A

direct person contact

usually an STI in adults

found in crowded living conditions (LIKE A NAVY BASE WHERE I GOT THIS GROSS ASS THING)

37
Q

What is the main manifestation of Pulex irritan (human flea) infestation

A

RASH

during blood meal, injects saliva that initiates allergic response

38
Q

What do Pulex irrians (human flea) ABSOLUTELY need to survive

A

BLOOD BLOOD BLOOOOOOOD

39
Q

ectoparasite that is MUCH MUCH bigger than Phthirus pubis and Sarcoptes scabiei

A

Pediculus humanus (head lice)

40
Q

Flea bite or scabies??

more common in children and elderly

A

scabies

41
Q

What is responsible for rocky mountain spotted fever in Arizona

A

brown dog tick

42
Q

What time of year does Rocky mountain spotted fever appear in Arizona?

A

April to October

peaks in June and July

Micro Final (Lauren, Shelby, and Annie) (4 decks)

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