Page 450 - Review of Medical Microbiology and Immunology ( PDFDrive )
P. 450
mebooksfree.com
mebooksfree.com
mebooksfree.com
mebooksfree.com
mebooksfree.com
mebooksfree.com
mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com
CHAPTER 52 Blood & Tissue Protozoa
439
mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com
mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com
mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com
FIGURE 52–5
Toxoplasma gondii. Life cycle. Top red arrows show the natural life cycle as T. gondii circulates between cats (#1), which
excrete oocysts in the feces that are eaten by mice, but also by domestic animals such as pigs and sheep. Cysts form in tissue such as muscle
and brain. The natural cycle is completed when cats eat mice. Humans are accidental hosts. They can be infected by the ingestion of under-
cooked pork and lamb (blue arrow #2) containing tissue cysts in muscle or by ingestion of food contaminated with cat feces containing oocysts
mebooksfree.com
mebooksfree.com
mebooksfree.com mebooksfree.com mebooksfree.com diagnose acute infections if a significant rise in antibody mebooksfree.com
(blue arrow #3). (Source: Dr. Alexander J. da Silva and Melanie Moser, Centers for Disease Control and Prevention.)
Laboratory Diagnosis
be maternal in origin. Tests of IgG antibody can be used to
For the diagnosis of acute and congenital infections, an
titer in paired sera is observed.
immunofluorescence assay for IgM antibody is used. IgM
Microscopic examination of Giemsa-stained prepara-
tions shows crescent-shaped trophozoites during acute
is used to diagnose congenital infection, because IgG can
mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com mebooksfree.com
