Q
QUARTAN MALARIA
Malaria fevers which recur approximately every 72 hours.
Caused by Plasmodium malariae.
QUOTIDIAN MALARIA
A characteristic of overlapping malarial infections in which
the fevers recur every 24 hours.
R
RECRUDESCENCE
The recurrence of symptoms after a temporary abatement of
some days or a few weeks.
REDIA
A larval stage of the digenetic trematodes developed by
asexual reproduction in the moluscan host; formed within the
sporocyst larva or mother redia.
RELAPSE
The recurrence of a disease process after an apparent
cessation of a few months or years.
RESERVOIR HOST
An animal which replaces man as a host in the life cycle of a
parasite.
RETICULOENDOTHELIAL
The fixed tissue, macrophages, reticular connective
SYSTEM
tissue, and the epithelium lining the blood vascular
system.
RHABDITIFORM
A small, rod-shaped, feeding and noninfective stage of the
LARVA
nematodes which develops within the egg and upon
hatching may further develop in moist, warm sail.
RHOPTRIES
Elongated.electron-dense structures extending anteriorly
within the polar rings of the Apicomplexa.
ROMANA'S SIGN
A symptom associated with infections of Trypanosoma cruzi
in which there is edema of the eye orbit and swelling of
adjacent lymph nodes.
ROSTELLUM
The raised area extending beyond the anterior portion of the
scolex of certain tapeworms which may or may not be
retractable.
ROUNDWORM
The common name for organisms belonging to the class
Nematoda.
MD0841
A-17