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PARASITOLOGY > midterms > Flashcards

midterms Flashcards

1
Q

refer to intestinal nematodes that are
transmitted through contaminated soil,

A

Soil-transmitted Helminths (STHs),

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2
Q

soil transmitted helminths exampless

A

giant
intestinal round worm of man Ascaris lumibricoides, the
human whipworm Trichuris trichuria, and the human
hookworms Ancylostoma duodenale and Necator americanus.

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3
Q

the giant intestinal roundworm”

A

Ascaris lumbricoides

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4
Q

morphology of ascaris lumbricides

A
  • resembles an earthworm.
  • Appearing light brown or pinkish when freshly expelled from the
    intestine but gradually turns white.
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5
Q

male a. lumbricoides

A

15 to 30 cm in length and 3 to 4 mm in diameter. It has a ventrally curled
tail with protruding spicules.

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6
Q

female a. lumbricoides

A
  • 20 to 35 cm in length and 5 mm in diameter and has a straight pointed
    posterior end.
  • Capable of liberating fertilized and unfertilized eggs, which are passed
    out with the feces of the human host.
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7
Q

a lumbricoides morphology

A

Both sexes have tapering ends with the anterior end being thinner than
the posterior. Fine striations are visible in the cuticle. The mouth at the
anterior end has three lips, one dorsally and two ventrally located.

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8
Q

a. lumbricoides egg

A

Longer and narrower, measuring
60 to 100 um by 40 to 60 um. It
has a thinner shell with more
variable mamillated layer.

Inside is a mass of refractile
granules .

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8
Q

a. lumbricoides egg

A

Round or oval, 45 to 70 μm in length and 35 to 45 um in width, and golden
brown due to bile.

Contains a zygote that is enclosed in a thick chitin shell with an external
albuminous mamillated covering (corticated eggs). In some cases, the
outermost mamillated layer is absent (decorticated eggs).

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9
Q

transmisison o fa lumbri

A

fecal-oral, Ingestion of infective embryonated ova occur in several ways:eating, f=drinking and ingestoin

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10
Q

diagnosis of a lumbricoides

A

kato katz, direct fecal smear (DFS) and formalin-ether
concentration technique (FECT).

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11
Q

light, moderate and heavy infection in a. lumbricoides

A

Light Infection
1,000 to 4,999

Moderate
Infection

5,000 to
49,000

Heavy
Infection
≥ 50,000

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12
Q

commonly used microscopy-based examination of stool samples for
the presence of ova includes d

A

irect fecal smear (DFS) and formalin-ether
concentration technique (FECT).

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13
Q

treatment of a lumbricoides

A

benzimidazoles mebendazole (MBZ) and
albendazole (ALB).

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14
Q

The dose and duration of treatment depends on STH species with A.
lumbricoides generally gets treated

A

for 1-3 days.

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15
Q

a lumbricoides can cause

A

In cases of intestinal obstruction and rectal
prolapse,

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16
Q

“ the human whipworm”

A

Trichuris trichuria

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17
Q

morphology of trichuris trichuria

A

The adult worm resembles a whip, the anterior three fifth is very thin and
hair-like consists of a long esophagus.

The thicker posterior portion contains intestine and sex organs.

They attach to the host through their slender anterior end.

Females are larger than the male approximately 30 to 45 mm.

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18
Q

egg of tt

A

Ellipsoidal to barrel-shaped, measuring 50 to 70 um in length and 25 um in
width, and has two distinct colorless polar plugs.

It has a double shell with a bi stained outer layer.

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19
Q

treatment of trichuristrichuira

A

benzimidazoles mebendazole (MBZ) and
albendazole (ALB).generally gets treated for 1-3 days.

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19
Q

infection rate of trichuris trchiura

A

Light Infection
1 to 999

Moderate
Infection
1,000 to 9,999

Heavy
Infection
≥ 10,000

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20
Q

hook worms

A

Ancylostoma duodenale, Necator americanus

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21
Q

a. duodunale morphology

A

Often reddish color when passed due to ingested blood. The mouth is on
the dorsal surface with two hook like teeth on the top and two triangular
cutting plates on the bottom.

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22
Q

n. americanus characterist8ics

A

Slightly smaller, the mouth has no teeth but with four chitinous cutting
plates, two each on the ventral and dorsal surfaces.

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23
Q

hookworm morphology

A

Adults have a creamy-white tough cuticle, a prominent anterior hook, and a
large oval bui capsule with specialized structures to aid in feeding.

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24
Q

hookworm ova characteristcics

A

Morphologically indistinguishable under light microscope. Their eggs are oval-shaped,
colorless, and thin-shelled, measuring 55 to 70 um in length and 35 to 42 um in width. Fresh
stool contains eggs with developing embryo in the early stages of cleavage (2-8 cells).

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25
Q

transmission of hookworm

A
  • skin penetration
  • translactational
  • percutaneous transmission
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26
Q

diagnosis and treatment o hookworm

A

kato-katz technique (K-K),slides should be read within
30 to 60 minutes after preparation,

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27
Q

infection rate of hookworms

A

Light Infection
1 to 1,999

Moderate
Infection
2,000 to 3,999

Heavy
Infection
≥ 4,000

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28
Q

female e. vermicularis

A

generally longer and wider,
measuring 8-13mm long and 0.3-
0.5mm wide

In the posterior part, female
possess a sharp and long-tail

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29
Q

male e. vermicularis

A

Adult male

2.5mm long and 0.1-0.2mm wide

have a blunt and curving tail
with a distinct copulatory
spicule

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30
Q

common in male and female e. vermicualris

A

three labia and cephalic expansions called alae in the anterior region near

the mouth are observed in both male and female adult worms

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30
Q

egg of e. vermicularis

A

Eggs are elongate to oval, asymmetrically flattened on
one side and almost colorless, with a sticky surface
covered with an albuminous layer, a thin hyaline layer,
and an embryonic membrane, with a size of 50-54
micrometers (um) in length by 20-27 pm in width usually
deposited in the perianal region of its human host in
clumps or groups.

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31
Q

A gravid female E. vermicularis may deposit
approximately

A

4,600 to 16,000 eggs

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32
Q

e vemricularis mature as adult worms
which may take

A

15-43
days from the time of
ingestion

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33
Q

is when a human directly
ingests the eggs from the perianal area by fingernail
contamination while

A

Autoinfection

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34
Q

when eggs hatch into larvae in the perianal
region and the larvae migrate back to the intestine.

A

Retroinfection

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35
Q

PATHOLOGY OF ENTEROBIASIS IS ASSOCIATED WITH THREE

MAJOR CAUSES:

A

damage caused in the intestine because of feeding on the intestinal mucosa
and gut bacteria

damage from extraintestinal migration

irritation from egg disposition in the perianal region

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36
Q

diagnosis of e. vermciualris

A

scotch tape or anal swab technique

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37
Q

scotch cellulose tape

A

one adhesive side
that is looped can be
used to collect pinworm
eggs on the perianal skin

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38
Q

antihelminthic drugs used to treat enterobiasis

A

albendazole, mebendazole, and pyrantel pamoate

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39
Q

“Rat Lungworm

A

ANGIOSTRONGYLUS

CANTONENSIS

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40
Q

A female A. Cantonensis
can lay up

A

15,000 eggs
daily

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41
Q

egg od a cantonensis

A

Eggs measure 46 to 48
μm long and 68 to 74 μm
wide.
They are unembryonated
when oviposited.

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42
Q

FEMALE A. CANTONENSIS

A

Ranges from 17 to 33 mm long and 0.28 to
0.5 mm wide

Female intestines were intertwined with
uterine tubules giving barber pole
appearance

The posterior end of the female worm is
blunt shaped.

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43
Q

MALE A CANTONENSIS

A

Ranges from 15 to 22 mm long and 0.25 to
0.35 mm wide

Males have a developed caudal bursa and
have spicules

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44
Q

A CANTONENSIS TRANSMISSION

A

Although the mechanism by which humans get infected is not yet clear,
transmission of A. Cantonensis is usually attributed to:

PATHOGENESIS AND TRANSMISSION

ingestion of the raw mollusk infected by the definitive host ingestion of leafy vegetables contaminated with mucus secretion of the mollusk

ingestion of paratenic host, such as freshwater prawns or crabs

drinking contaminated water

Presence of the A. Cantonensis in human body may lead to variety of clinical manifestations called Angiostrongyliasis

Symptoms incudes headaches, stiffness of neck, vomiting, fever, paralysis and tremors

Eosinophilic Mengitis, shows the presence of this worm in our body, it alsoincreases CSF and eosinophils (WBC).

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45
Q
A
46
Q

A CANTONENSIS CAUSES

A

causative agent of eosinophilic meningoencephalitis

47
Q

A CANTONENSIS diagnosis

A

dot-blot ELISA and immuno-
polymerase chain reaction (PCR)

48
Q

a cantonensis reatment

A

no anthelminthic treatment established against A.
Cantonensis infection although it is possible to treat the infection at early
stage through the following:
Treatment

Thiabendazole
Combination of corticosteroids and mebendazole
CSF withdrawal
Surgery (for ocular angiostrongyliasis)

49
Q

Intestinal Capillariasis Location

A

: Mucosa of small intestine

50
Q

Intestinal Nematodes: Pudoc Worm

A

CAPILLARIA

PHILIPPINENSIS

51
Q

ova of capillaria philipinensis

A

(Produced by oviparous female)
Peanut shaped
Has striated sheath
Flat bipolar plugs

52
Q

disease of capillaria philipinensis

A

DISEASE: Intestinal Capillariasis

53
Q

(hardening,
inflammation of mucosa, dissapearance of mucosal glands,
degeneration of intestinal vili)

A

chronic malabsorption-diarrhea syndrome

54
Q

`trichonella spiralis disease

A

trichinellosis

55
Q

diagnosis of trichinella spiralis

A

antibody detection or muscle biopsy

56
Q

treatment of t spiralis

A

400mg of albendazole oral twice a day 8-14 days. mebendazole, 200-400mg first 3 days of treatment increase in following 10 days of treatment

57
Q

filiarial worms disease

A

lymphatic filariasis

58
Q

firlarial worms example

A

[Wuchereria bancrofti] [Brugia malayi] [Brugia timori]

59
Q

human disease caused by parasitic roundworms

A

Lymphatic filariasis

60
Q

by parasitic roundworms

A

filarial
worms.

61
Q

The main manifestation of this disease is the impairment of the lympathic system which leads to
the abnormal enlargement of body parts, which causing pain, severe disability and social stigma
for the affetted individual.

A

filarial wormms

62
Q

thickened and
hardened skin and fluid retention,
leading to painful, swollen and enlarged
body parts.

A

Elephantiasis

63
Q

characteristics of wucheria bancrofti

A

The female worms measure 80 to 100 mm in length and 0.24 to 0.30 mm in diameter.

The females are viviparous.
Adults produce microfilariae measuring 244 to 296 μm by 7.5 to 10 μm, which are sheathed
and have nocturnal periodicity.

The life span of the adult worms is long, probably several years (5-10 year or even more).

64
Q

treatmet of filarial worms

A

Diethylcarbamazine (DEZ), Ivermectin, albendazole, diethylcabamazine citrate

65
Q

the only two
species belonging to the family lymenolepididae that are
known to infect man.

A

Hymenolepis nana and H. diminuta

66
Q

man. Hymenolepis nana is commonly referred to as
the

A

dwarf tapeworm

67
Q

while Hymenolepis diminuta is known as the
.

A

Rat tapeworm

68
Q

characteristics of h. nana

A

Small species, rarely exceeding 40 mm in
length.

Scolex with 4 suckers, and a short
retractable rostellum armed with hooks.

Segments wider than long, unilateral
genital pores, and each mature proglottid
contains three testes.

Gravid proglottid disintegrates, releasing
immediately infectious round to oval eggs.

69
Q

hymenolepis diminuta characteristics

A

Larger than H. nana, measuring up to 90 cm.
Scolex with 4 suckers, and a rostellum
without hooks.

Segments wider than long, unilateral genital
pores, and each mature proglottid contains
three testes.

Gravid proglottid disintegrates, releasing
non-immediately infectious round to oval
eggs larger than H. nana.

Requires an arthropod intermediate host in
its life cycle.

70
Q

trasmission of h. nana and h.. diminuta

A

autoinfection and accidental infection

71
Q

Three species causing taeniasis in humans:

A

Taenia solium, T. saginata, and T.
asiatica.

72
Q

taenia solium common named

A

Pork Tapeworm

73
Q

taenia saginata common name

A

beef tapeworm

74
Q

characteristics of t solium

A

Size: Adult worms are relatively small, ranging from 2 to 4 meters in length.
Scolex: Features a small, rounded scolex with four suckers and a rostellum armed
with hooks.
Proglottids: The mature proglottids are wider than they are long and contain a
uterus with 7 to 11 lateral branches, each ending in an egg.
Genital Pore: Located laterally on mature proglottids.
Eggs: Oval-shaped, with a radially striated shell.

75
Q

characteristics of t saginata

A

Size: Adult worms are larger, ranging from 4 to 10 meters in length.
Scolex: Features a larger, rounded scolex with four suckers but lacks a rostellum
or hooks.
Proglottids: Mature proglottids are longer than they are wide and contain a
uterus with 12 to 32 lateral branches, each ending in an egg.
Genital Pore: Located medially on mature proglottids.
Eggs: Oval-shaped, similar to T. solium, with a radially striated shell.

76
Q

characteristics of t asiatica

A

Size: Similar in size to Taenia saginata, ranging from 4 to 8 meters in length.
Scolex: Resembles the scolex of Taenia saginata, featuring four suckers but
lacking a rostellum or hooks.
Proglottids: Morphologically similar to T. saginata, with mature proglottids being
longer than they are wide, and a uterus containing multiple lateral branches.
Genital Pore: Located medially on mature proglottids.
Eggs: Oval-shaped, similar to T. solium and T. saginata, with a radially striated
shell.

77
Q

TREATMENT of taenia

A

praziquantel. niclosamide, alvendazole

78
Q

sign and symptom of taenia acute

A

nause, c=vomitting, abdominal pain

79
Q

insigns and symptoms of taenia itermediate

A

Mild Gastrointestinal Symptoms:
digestive issues and discomfort

80
Q

signs and symptoms chronic

A

proglottid passage, gastrointestinal symptoms (digestive discomfort and weight loss), nutritional deficiency, allergic reaction

81
Q

sign and symptom of taenia chronic

A

nuerocytecirosis

82
Q

diagnosis of taenia

A

1.Stool Sample Examination:

2.Gravid Proglottids and Scolex Examination

3.PCR and Restriction Enzyme Analysis (REA)
LABORATORY

83
Q

treatment of taenia

A

praziquantel, niclosamide, aldbendazole

84
Q

most common tapeworm

A

commonest species being Diphyllobothrium latum

85
Q

the definitive hosts ofD. latum

A

are humans and other fish-eating mammals

86
Q

may also cause pernicious anemia andvitamin B12deficienc

A

d. latum

87
Q

characterstics of d. latum

A

Scolex – elliptical, spatula-like, or almond in shape
About 2-3 mm long and provided with a pair of linear muscular grooves (bothria)
Uses this as a means of attachment to the host (small intestine) by muscular tonus (muscle tension) of its strobila (segmented body). It is composed of proglottids (segments), each carrying two different sex organs.
The uterus is a bilobed structure that loops, extending from the ovary to the uterine pore on the midventral surface of the segment, through which the mature proglottids release the eggs.
Anapolytic – no detachment of proglottids from the strobila

88
Q

egg of d latum

A

Eggs: are ovoid, golden-brown, and have an operculum at one end with a small thickening of the shell at the opposite end.
Measures 58-76 um by 40-51 um
Fully developed eggs are discharged in the uterine pore
Terminal proglottid gradually becomes exhausted and disintegrate (not gravid)

89
Q

larva of d latum

A

Larva: has three stages

First stage larva: Coracidium

Second stage larva: Procercoid (found inside the copepod crustacean, e.g., Cyclops)

Third stage larva: Plerocercoid (found inside the musculature of freshwater fishes)
Both Procercoid and Plerocercoid lacks a bladder.

90
Q

intermediate host of d latum

A

1st intermediate host copepads: diaptomus spp, cyclops spp
2nd intermedidate host:fresh braking water fish, salmonoid fish

91
Q

condition characterized by enlarge red blood cells

A

macrocytosis

92
Q

(anemia and neurological problems associated with vitamin B12 deficiency) 80% is said to be consumed by the tapeworm

A

Bothriocephalus anemia

93
Q

diagnostic stage of d latum

A

egg with operculum or segments showing genital pores

94
Q

diagnostic tool of d latum

A

stool examination, cytochrome c oxidase subunit 1, tRNA Pro, tRNA Ile, tRNA Lys, NADH dehydrogenase, and cytochrome b gengenes for accurate speciation of D. latum

95
Q

treatment of d latum

A

praziquantel, niclosamide, gastrografin

96
Q

domestic dogs and
cats generally found in warmer and more
humid regions of Canada, such as
southern coastal BC.

A

dIpyllidium caninum

97
Q

diagnosis of d caninum

A

flotation method

98
Q

treatment of d caninium

A

praziquantel, epsiprantel

99
Q

(Lung Fluke)

A

Paragonimus
Westermani

100
Q

tropical disease caused by lung flukes
of the genus Paragonimus

A

Paragonimiasis

101
Q

diagnosis of p. westermani

A

katoo katz technique,Ziehl-Neelsen Staining (ZNS), Sodium Hydroxide (NaOH) Concentration Technique

102
Q

treatment of p westermani

A

praziquantal, triclabendazole

103
Q

B L O O D F L U K E S

A

Schistosoma

japonicum

104
Q

diagnosis of schistosoma japonica

A

circum-oval precipitin
test (COPT),dipstick dye immunoassay (DDIA), Rectal biopsy
Ultrasonography
Molecular methods

105
Q

Treatment & Prevention OF SCHISTOSOMA JAPONICUM

A

Praziquantel (PZQ)
ArtemetherQ

106
Q

Zipper Tapeworm

A

SPIROMETRA SPP

107
Q

TREATMENT FOR SPIROMETRA SPP

A

PRAZIQUANTAL, SURGICAL REMOCAL, THERAPIE

108
Q

occurs with other
helminths that can be detected in fecal samples, such as the soil-transmitted helminths Ascaris
lumbricoides, Trichuris trichuria, hookworms, and food-borne trematodes

A

Schistosoma
japonicum

109
Q
  • causative agent of schistosomiasis japonica
A

S. japonicum-

110
Q

biggest of all
blood flukes;

A

S. Japonicum

111
Q

usually found
held in the gynecophoric canal of the male,

A

S. Japonicum female

112
Q

broadly ovoidal in shape with very characteristics of cellular
debris, ova has a rudimentary or abbreviated lateral spine, shell stained acid-fast,
sloping shoulder miracedium inside

A

ova of s. japonicum

113
Q

Ribbon-like/white bandage
appearance.

A

spirometra spp

114
Q
A
115
Q
A

PARASITOLOGY (7 decks)

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