parasitology done

8/18/2019 Parasitology Done

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Nematoda

The egg on the left was found in the feces of an individual that

recently arrived from Puerto Rico. The egg measured about 52

micrometers long x 22 micrometers

wide. What species does it

represent

The eggs of Trichuris (Trichocephalus)

trichiura are very distinctive with the

smooth wall and bipolar plugs

The worm was found attached to the wall of the small intestine of

a patient undergoing intestinal surgery for another matter. !ou are

viewing the buccal cavity of the parasite. What species does it

represent

Ancylostoma duodenale.. Note the large, ventral cutting teeth (top)

The eggs on the left were found using the scotch tape test on a

" year old #lorida boy visiting relatives in $ansas. The eggs

measured about 55

micrometers long x 25

micrometers wide. What

species does it represent

Enterobius vermicularis. Theeggs of Enterobius vermicularis

(and Enterobius gregori) are

smooth and slightly flattened along one side.

The microfilaria on the left was seen

in a blood smear of a graduate

student native to %frica. !ou note that

it is sheathed& fails to possess tail

nuclei& and measures about 2'(

micrometers in length by ).5

micrometers in width in the fixed

smear. What species does it represent

Wuchereria bancrofti. os!uitos are the

vector.

The egg on the left was found

in the feces of a *anhattan&

$ansas resident. % friend of

yours sent you the fecal samplegratis +yes& this happens often

when you are a parasitologist,.

The egg measured about -5

micrometers long x -(

micrometers wide. What species

is represented

Ascaris lumbricoides. This is a corticated,viable egg that simply

has odd, lumpy pro"ections of the outer protein coat.

The egg on the left was found in the

feces of a ' year old $ansas /tate

0niversity student who hails from

%labama. The egg measured about 1(micrometers long x ) micrometers

wide. What species does it represent

Necator americanus. Eggs of

Ancylostoma duodenale tend to beslightly shorter and less elongate, but in

reality the eggs of the two are very difficult to tell apart. Necator

americanus is far more common in North America than

The worm on the left waspassed in the stool of a "

year old child. 3t measured

( mm in length. What


Enterobius vermicularis. #emale Enterobius vermicularis andEnterobius gregori are impossible to distinguish.Note the distinct

posterior esophageal bulb and attenuated tail of this female worm.

The worm on the left was passed in the

stool of a small child in *anhattan& $ansas

in '"". The entire worm measured about

2 cm +' inches, in length. What species is

represented

Ascaris lumbricoides. This female roundwormwas indeed passed by a child in anhattan,

$% and is typical of the truly large si&e of the

adult female ascarid.


feces of an individual returning from

4olivia after a 2 month research field

trip. The egg measured about '(

micrometers in length x -5

micrometers in width. What species

does it represent

Ascaris lumbricoides. This is anunfertili&ed egg' the outer surface is oddly mammillated to a degree so that the

surface is lumpier than the fertili&ed egg. The inner embryonic layers are

lacing so that the cytoplasm inside is highly disorgani&ed.

The egg on the left was found in

the feces of a college professor in

*anhattan& $ansas. The egg

measured about "( micrometers

in length x -5 micrometers in

width. What species does it

represent

Ascaris lumbricoides. This is afertili&ed egg' the outer surface is

mammillated and the cytoplasm

within enclosed by distinct membranes.

The egg on the left was found in the fecesof a young girl in *anhattan& $ansas.

ther eggs with thic6er& more mammilated

walls and of similar si7e were noted. The

egg measured about "( micrometers in

length x -5 micrometers in width. What


Ascaris lumbricoides. This is a fertili&ed egg'

the outer mammillated surface has been

stripped away which occasionally occurs.

This woman is suffering from whatparasitic condition resulting in the

swelling of the lower extremities as

noted

Elephantiasis. Wuchereria bancrofti, a

lymphatic filarid, is the principle agent that

initiates chronic elephantiasis below thewaist. The swelling is due (primarily) to

chronic fibrosis over many years.


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The worm onthe left was

one of several

passed in the

stool of a *anhattan resident following antiparasitic therapy.

The worm measured nearly ) cm +1 inches, in length. What

species is represented

Ascaris lumbricoides. This worm was passed in *++ by a

anhattan resident and is a male, as noted by the hooed tail.

The photograph on the left is a s8uashpreparation from s6eletal muscle tissue. What


Trichinella spiralis. The first stage larvae born to

females in the intestine mae their way to seletalmuscle tissue. ere, they become encapsulated in

muscle fibers as shown. -ene epression in the

host cell becomes modified so that the muscle cell

becomes what is termed a nurse cell, whichsupports the dormant larva.

The egg on the leftwas found in a fecal

flotation from a '

year old boy. 3t

measured about "(

micrometers in

length by (

micrometers in width. What species does it

represent

Enterobius vermicularis. Note that the egg is partially

embryonated and is slightly flattened along one side.

The larvae on the left was passed in thestool of a -) year old 9ietnam veteran.

3t measured about (( micrometers in

length. *any other identical larvae

were also present& and even a few

elongate& slender female worms

measuring about 2.5 mm in length were

noted. What species does it represent

%trongyloides stercoralis. although other less commonly seen members of the genus

also infect humans. The rhabditiform larvae in the feces are diagnostic, and adults are

occasionally seen. /ecause infections can be autoinfective, larvae may occasionally

be seen in the sputum and urine.

The worm on the left was one of many foundembedded in the prolapsed rectum of a ' year old

Puerto Rican child visiting relatives in $ansas. 3t

measured -5 mm long. What species does it

represent Trichuris trichiura.. Whipworms are !uitecommon in warm, moist climates. eavyinfections may

result in prolapsed rectum, finger clubbing, and growth

retardation in children. The more slender end is the

anterior end which threads itself into the intestinal wall'

the larger end contains the reproductive organs. This is a female worm.

The worm on the left was foundattached to the wall of the small

intestine of an individual during

autopsy. The worm is an

incidental finding only. !ou are

viewing the buccal cavity of the

parasite. What species does it

represent

Necator americanus.. Necator

americanus has ventral cutting plates.

The two eggs on the left are from a human stool specimen. The larger of the two eggs measures 15 micrometers

long by -5 micrometers wide. %re they both from the same species of worm

0es.. They are eggs of Ascaris lumbricoides. The egg on the far left lacs mammilations whereas the other egg is

heavily mammilated. /oth may embryonate and become infective.

:estodes ; Trematodes

The adult

trematode on

the left was

removed

from the bile

duct of a recent immigrant from


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The eggs on the left were

found in the feces of a 2

year graduate student who

came here from Thailand.

The eggs measured about

5 micrometers in length.

What species does it

representTaenia sp.Eggs of Taenia saginatus tend to be slightly moreellipsoidal than those of Taenia solium, but in most cases one

cannot really distinguish between the two

The eggs on the left were

found in the urine of a peace

corp wor6er with hematuria

and who had >ust returned

after spending 2 years in

=gypt. The eggs measured

about "( micrometers long x

"( micrometers wide. What species do they represent%chistosoma haematobium.The adult worms reside mainly in the veins ofthe urinary bladder pleus. Embryonated eggs, with a terminal spine, are

passed with the urine.

The egg on the left was found

during a routine screen of the

feces of a :hinese *icrobiology

student. The egg measured about

)( micrometers long x "(

micrometers wide. What species

does it represent

%chistosoma "aponicum.The egg of

%chistosoma "aponicum is embryonated when passed in the fecesand possesses a tiny sublateral spine that can be easily seen only

when the egg is in the correct orientation.


feces of a Puerto Rican coed who

was ta6ing a human parasitology

course. The egg measured about "5

micrometers long x 1( micrometers

wide. What species does it

represent

%chistosoma mansoni.The eggs of

%chistosoma mansoni are passed in the feces and have a large sublateralspine

The worms at the left

are those of

/chistosoma

mansoni. The male is

holding the female in

a longitudinal groove

down his body. What

is this groove called

-ynecophoral canal


sputum of an elderly $orean

gentleman. The egg measured about

)5 micrometers long x -)

micrometers wide. What species does

it represent

6aragonimus westermani.0ou are

correct. The 5nd intermediate host isusually a #W crab. Note the rim around the

edge of the operculum (the shoulders)

The egg on the left was found in

the feces of a graduate student

from Thailand. The egg

measured about 2) micrometers

long x " micrometers wide.

What species does it represent

1lonorchis sinensis.The eggs of

1lonorchis (and some of the other bile duct flues, as well as some

heterophyids) are small, passed embryonated, and have a tiny posterior nob that is sometimes present

The proglottid on the left is one of a string

passed by a student who returned from

*adison& Wisconsin several months

earlier. =ach proglottid measured slightly

under cm in width. What species is

represented

7iphyllobothrium latum.%trings of

proglottids are fre!uently passed in the feces

of infectedindividuals. The dar structure in the middle of each proglottid is the

rosette3shaped uterus filled with eggs.

The parasite on the left was

purged from the intestinal tract

of a dog in *anhattan& $ansas.

3t measured 1 mm in total

length. %lthough this adult

stage is not found in humans&

the larval stages can be pathogenic. What species does it represent

Echinococcus granulosus. umans may serve as intermediate hosts for theunilocular hydatid cyst.

The tapeworm larval stage on the

left is pinhead si7e& and was

removed from a grasshopper in

*anhattan& $ansas. What type of

larval stage does it represent

1ysticercoid.The cysticercoid is a

solid3bodied larval stage that contains

an invaginated scole.

The photograph of the tapeworm scolex on the left represents which of the following species

Taenia solium.The scole is from a newly ecysted cysticercus. Although not easily seen in this photograph, the

scole possesses 5 rows of large hoos.

Proto7oa

The flagellates on the left were

found in a vaginal smear of a

female student +obviously, who

complained of vaginitis. The

tropho7oites measured about 25

micrometers long x 1

micrometers wide. What species do they represent Trichomonas vaginalis . This species inhabits the urogenital tract, often

asymptomatic in males, and has + anterior flagella and a 8th that forms the

undulating membrane. The end of the undulating membrane generally

ends either at the tropho&oite, or slightly anterior to the midline.

The fully sporulated oocyst on the left

was from a population of oocysts found

following a flotation of a stool from an

%3?/ patient. ocysts averaged about

).- micrometers long x ".2 micrometers

wide. What species is represented

1ryptosporidium muris. 1ryptosporidium muris is a gastric form,somewhat larger than 1. parvum, and usually found in non3human

hosts. To date, there are only a handful papers ever describing

this parasite from humans, usually from 9: positive patients.

4


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1ryptosporidium

parvum. ;ocysts of

1ryptosporidium

spp. stain reddish

with the acid faststain.


5/5

about "( micrometers in diameter. What species is

represented

Tooplasma gondii. The dar dots are the nuclei of the

brady&oites.

cramping. The cystBli6e stage shown measures about ( micrometers in

length. What species is represented 9sospora belli. The elongate oocysts are

passed unsporulated, and complete development eogenously

The photograph on the left is from a fecal smear.

The patient had periodic bouts of diarrhea. The

parasite measures about 2 micrometers in

length. What species is represented

-iardia lamblia. -iardia lamblia (-iardiaintestinalis) is the only diplomonadid to occur inhumans.

The photograph on the left is of a

human blood smear. 4ased solely on

the structure of the gametocytes& what

species of malaria is represented

6lasmodium falciparum. This species of malaria has characteristic banana3shapedgametocytes.

The photograph on the left is an iron

haematoxylin stained amoeba tropho7oite

from a fecal smear. The patient had periodic

bouts of diarrhea& abdominal cramping& and

some blood in the stool. The parasite

measures about 25 micrometers in length.

What species is represented

Entamoeba histolytica. Note that the endosome

is relatively small and near centrally located.

The photograph on the left is from a

human fecal smear. The cyst

measured about 55 micrometers in

diameter. The patient had moderate

diarrhea. What species is

represented

/alantidium coli. This ciliate has large cysts and tropho&oites, and

possesses the large dumb3bell lie macronucleus as shown.

The photograph on the left is from the heart muscle of a middleBaged 4ra7ilian man who diedsuddenly of heart failure. What species is represented

Trypanosoma cru&i. The structure is a pseudocyst with amastigotes. The parasite is transmitted byreduviids.

%rthropoda

The insects on the left represent a

nymph and adult of what type of

arthropod

eduviid. eduviids (Assassin

bugs, issing bugs, cone3nosed

bugs, etc.) tae blood meals and are

the vectors of 1hagaBs disease. This particular species is a member of the genus Triatoma. 9f you wish to

see additional images of reduviids, tag the tiny icon in the bottom right

corner of the page.

The insect to the left has found attached

to pubic hair by a student in class.

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