Volume 24, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



oocysts in cat feces were marked with a tracer amount of strontium-85 (85-SR), and were superficially buried simulating the natural disposal of feces by cats. Oocyst infectivity in Costa Rica was followed qualitatively and persisted for 1 year in three shaded sites, two moist, and one relatively dry site. Oocyst infectivity was quantitated in the Kansas deposit over a period of 18 months, including two winters. After initial mixing in soil, the level of infectivity remained fairly stable. Infectivity was recovered, probably from the surface of one , serveral isopods, and earthworms. These data on persistence of oocysts in soil support the concept that infectivity in nature may be increased logarithmically by cats.


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