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  • Title: Detection of Toxoplasma gondii parasitemia in experimentally inoculated cats.
    Author: Burney DP, Lappin MR, Spilker M, McReynolds L.
    Journal: J Parasitol; 1999 Oct; 85(5):947-51. PubMed ID: 10577732.
    Abstract:
    Toxoplasma gondii B1 gene polymerase chain reaction (PCR) amplification utilizing a flanking and nesting reaction was compared to mouse bioassay on feline whole blood samples collected before and after experimental inoculation with T. gondii. Samples were collected from 5 cats prior to inoculation with T. gondii and on days 3, 7, 10, 14, 21, 28, 35, 42, 49, 56, 63, 70, 84, 112, 140, 143, 147, 150, 154, 161, 168, 175, and 182 after inoculation. Cats were challenged with T. gondii orally on day 140. Bioassay was found to be less effective for detection of parasitemia than B1 gene PCR. Parasitemia was detected in all 5 cats by PCR multiple times after primary and challenge inoculation. Detection of T. gondii parasitemia by PCR utilizing the flanking reaction described here may be useful in predicting the oocyst shedding period in individual cats. As none of the cats developed signs of systemic illness, yet were chronically parasitemic, T. gondii whole-blood PCR is not helpful as a diagnostic test for clinical feline toxoplasmosis.
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