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Microbio II Exam 1 > Arthropod Infections > Flashcards

Arthropod Infections Flashcards

1
Q

different types of louse infestations
head
body
nether

A

pediculus humanus capitis- head
pediculus humanus corporis- body

phthirus pubis- crab lous

all insects

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2
Q

epi louse

reservoir

A

worldwide

humans are the only reservoirs and definitive hosts

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3
Q

how louse transmitted

A

person to person

contact with fomites containing eggs or adults

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4
Q

life cycle louse

location of eggs

A

undergo incomplete metamorphosis

head lice- eggs in hair (nits)
body lice- eggs in clothes
crab lice- eyebrows and pubic region

the eggs hatch and develop into nymphs – develop into adults

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5
Q

path louse

sensitivity?

vectors???

A

suck blood ad inject lytic compounds that act as antigens

primary hypersensitivity 3-8 months after original infestation ( sensitivity to feces)

the lice serve as vectors for other viral bacterial diseases

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6
Q

ss louse

what can result

A

papules, ulcerations, anemia, intense itching

which can result in secondary bacterial infections

result in toxic follicular conjunctivitis due to hyper sensitivity

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7
Q

dx louse

A

history of contact

identification of insect

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8
Q

tx louse

A

malathion

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9
Q

bed bug caused by

A

cimex lenticularius (insect)

undergo incomplete metamorphosis

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10
Q

epi bed bug

A

found world wide-

humans and non humans

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11
Q

what temps are lethal to bed bug

A

above 98 or below 5 f

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12
Q

life cycle bed bug

stages?

A

adults suck blood from humans
lead eggs in bedding and cracks on walls

5 stages of nymph- which all need blood to feed on and grow to next

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13
Q

how can you see bed bug

A

harborage sites- brown black spots of dried blood - sheets, clothing skin- also have stink glands and smell

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14
Q

path bed bug

time?

characteristic of infection?

A

4 weeks from eggs to adults

feed at night and inject lytic substances under skin which act as Allergens*

characteristic- several bites in a row

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15
Q

immunity bed bug

A

lytic compounds produce allergic responses at lesions and site of bite

NO immunity

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16
Q

ss bed bug

A

white/ red it itching hard welts– develop into sores

allergic responses produce granulomas, hemorrhagic bullae or second act inf.

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17
Q

tx bed bug

A

steroids

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18
Q

myasis caused by

metamorphosis

A

cochiomyia- screw worm flies
dermatobia- bot flies
ceterebra- warble flies
cordylobia- mango flies

complete

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19
Q

epi myasis

A

world wide
human
non human

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20
Q

life cycle myasis

A

flies lay eggs on human skin

eggs hatch and invade healthy or necrotic tissue and develop into adult flies

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21
Q

path myasis

hosts?

A

location of larva determine significance

larva release lytic enzymes– penetrate tissues
eggs on food produce intestinal lesion
maggots- pus filed lesions

adult flies serve as intermediate hosts for other diseases

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22
Q

ss myasis

A

swollen PAINLESS lesions that are self healing after larva pupates and falls out

flies can also lay eggs on mucous membranes (nostrils eyes rectal etc)

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23
Q

dx myasis

A

history

contact with larva

24
Q

tx myasis

A

larga removed surgically after vaseline and irrigation of wound

good sanitation

25
Q

follicular acariasis caused by?

A

demodex folliculorum

arachnid

26
Q

epi of follicular acariasis

reservoir

A

world wide

humans: reservoir and definitive hosts

27
Q

life cycle follicular acariasis

A

adult mites: worm like with short capital,, long abdomen short legs

eggs laid hatch into larva and develop into adult mites- transmitted directly p2p

28
Q

where can demodexx folliculorum found

A

hair follicles, sebaceous glands scalp and eyelids

29
Q

path follicular acariasis

A

mites can produce keratitis
infested sebaceous glads can result in granulomas and acne

facial cream

30
Q

ss follicular acariasis

what increases infection

A

infestation w acne– doesn’t cause inflammatory rxn unless secondary bacterial infections develop (in itself doesn’t produce symptoms)

use of cosmetics increase it

31
Q

dx follicular acariasis

A

cigar shaped mites found in follicle, skin scrapings

32
Q

tx follicular acariasis

A

lindane

33
Q

trombidiosis caused by?

chiggers

A

eutrombicula alfreddugesi

aka chiggers (arachnid)

34
Q

epi trombidiosis

transmission

A

world wide
domestic wild animals birds and humans

contact with tall weeds and grass that contain mite

35
Q

life cycle eutrombicula

A

adult mites are herbivores that live in grassy terrains

eggs are laid in clusters
ectoparasites on humans and fall off ?

36
Q

life cycle eutrombicula

A

50-70 days

37
Q

which one of eutrombicula life cycle harms humans

A

mite larva

38
Q

path trombidiosis

A

mite larva bite thru skin of humans– which inject saliva that has lytic compounds that dissolve tissue but DON’T suck blood

39
Q

allergy trombidiosis

A

necrotic rxn and allergic rxn develop first exposure

40
Q

ss trombidiosis

A

small itching red spots into dermatitis– pustules and wheals where clothing is tight*

last weeks until swelling subsides
can cause fever and bacterial infections

41
Q

scabies caused by

aka

A

sarcoptes scabiei (arachnid)

seven year itch

42
Q

epi scabies

hosts

A

worldwide
humans and dogs

common in slums jails and armies (crowded areas)

transmission by intimate human to human contact

43
Q

life cycle scabies

A

mate on outside of skin and the penetrate
male burrow, females lay the eggs in tunnels

larvas leave tunnels to infect new hosts

44
Q

path scabies

A

the mites live in cutaneous burrows* progress without symptoms being noticed
lesion are produced to allergic reactions to eggs larva and adult mites

45
Q

ss scabies

A

reddish elevated tracts in kin between fingers forearms knees elbows crotch – can develop into rash like lesions

intense itching spreads infection can develop erythematous eruptions and granulomas

46
Q

dx scabies

A

staining of follicle / skin scraping with rod mites with short legs

(hard to get rid off)

47
Q

tx scabies

A

permethrin

hot soapy baths

48
Q

tx trombidiosis

A

steroids

49
Q

sea lice caused by

A

linuche unguiculata (thimble jellyfish )

50
Q

epi sea lice

A

south florida mid may early july

feed on small crustaceans

51
Q

life cycle sea lice

A

linuche unguiculata larva float freely onto shore line

52
Q

path sea lice

A

stings- immediately or lesions develop later, sea lice become trapped and squeezed

different people have different reactions to stings- mild irritation or severe allergic rxn

53
Q

ss sea lice

A

itchy red skin, develop into hives and swelling

multiple Stunts can result into difficulty breathing

54
Q

dx sea lice

A

hx of swimming, and presence of cutanouse lesions

55
Q

tx sea lice

A

histamines

Microbio II Exam 1 (10 decks)

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