[Elizabeth_Zeibig]_Clinical_Parasitology__A_Practi(z-lib.org)

APPENDIX A
Glossary
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consists of multiple nuclear divisions followed
by cytoplasmic division.
schizont (pl., schizonts) Morphologic form, most
notably found in the Plasmodium spp. life cycle,
responsible for the development and maturing of
a merozoite, a morphologic form critical to the
survival and continued replication of the parasites
in a human host.
Schüffner’s dot (pl., dots) Tiny granule visible in
the cytoplasm of red blood cells infected with
Plasmodium vivax or Plasmodium ovale that
appears red with Giemsa stain; also known as
eosinophilic stippling.
scolex (pl., scolices) Anterior end of a tapeworm.
scutum Dorsal surface shield of hard ticks. The
scutum of females covers part of the dorsal
surface, whereas that of the males covers the
entire dorsal surface.
sheath Delicate membrane that surrounds the
microfilariae; also known as an egg membrane
because when present, it is visible at birth. The
sheath extends past the anterior and posterior
ends and may be retained or lost by the microfilaria,
depending on the species.
somnolence Excessive sleepiness.
sparganosis Human condition that results from
the accidental ingestion of the procercoid larval
stage of Diphyllobothrium latum.
sparganum Condition that occurs after a tapeworm
migrates and invades subcutaneous tissue,
often described as white, wrinkled, and ribbonshaped;
may occur with infections of Diphyllobothrium
latum, known as sparganosis.
sporoblast (pl., sporoblasts) Roundish immature
sac within the oocyst consisting of developing
sporozoites.
sporocyst (pl., sporocysts) Roundish mature sac
(pertaining to sporozoa) within the oocyst containing
fully developed, sausage-shaped sporozoites;
or saclike structure (pertaining to flukes)
serving as the larval form of flukes that is formed
in the snail and that emerges from the
miracidium.
sporogony Process of spore and sporozoite production
via sexual reproduction.
Sporozoa Motile class of Protozoa that has no
apparent organelles for locomotion.
sporozoite (pl., sporozoites) Infective stage of
malaria developed in the mosquito vector and
transmitted via a blood meal to an unsuspecting
human.
stippling Fine speckled dots within a blood cell,
visible when treated with a basic stain.
strobila General term used to denote the entire
tapeworm body.
subperiodic Term that describes when the timing
of an occurrence, such as the presence of microfilariae
in the blood, is not clear-cut.
sucker (pl., suckers) A cup-shaped structure
located on the scolex that aid cestodes in intestinal
attachment. Each scolex typically contains
four suckers.
swimmer’s itch Condition (zoonosis) in which the
cercariae of select animal and bird Schistosoma
spp. penetrate human skin and cause an allergic
response. The life cycle is not completed.
symbiosis Living together (association) of two
organisms, each of a different species.
tachyzoite (pl., tachyzoites) Rapidly multiplying
trophozoite stage of Toxoplasma gondii.
tapeworm (pl., tapeworms) Common name for
a cestode.
tegument Outer surface of the cestodes and
trematodes.
Texas cattle fever The condition caused by
Babesia that severely affected the cattle industry;
also known as red water fever.
tissue roundworm (pl., tissue roundworms)
Common name for a filaria.
transport host (pl., hosts) A host responsible for
transferring a parasite from one location to
another.
Trematoda Referning to the trematodes (flukes).
trematode (pl., trematodes) Alternate name of
the class of helminths known as Trematoda;
common name, flukes. Consists primarily of
organisms that are nonsegmented, flattened, and
leaf-shaped.
trophozoite (pl., trophozoites) Amebic stage
characterized by its ability to move, obtain food,
and multiply; often abbreviated as troph or
trophs.
trypanosomiasis General and collective term for
the diseases caused by any of the trypanosomal
hemoflagellates.
trypomastigote (pl., trypomastigotes) Long
and slender to stubby hemoflagellate morphologic
form of Trypanosoma spp. that typically
looks like the letter C or U on permanent stain;
characterized by a full body length undulating
membrane. A free flagellum may or may not be
present. It is found in vectors and humans.