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
species does it represent
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.
The egg on the left was found in the
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
species does it represent
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
species does it represent
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.
The egg on the left was found in the
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
The egg on the left was found in the
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.
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1ryptosporidium
parvum. ;ocysts of
1ryptosporidium
spp. stain reddish
with the acid faststain.
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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.