Toxoplasma gondii Isolates of Free-Ranging Chickens From Rio de Janeiro, Brazil: Mouse Mortality, Genotype, and Oocyst Shedding by Cats
- 1 August 2003
- journal article
- Published by American Society of Parasitologists in Journal of Parasitology
- Vol. 89 (4) , 851-853
- https://doi.org/10.1645/ge-60r
Abstract
Most isolates of Toxoplasma gondii can be grouped into 3 genetic lineages. In the present study, 67 isolates of T. gondii were obtained by bioassay in mice inoculated with brains and hearts of 96 asymptomatic chickens from an area highly endemic to human infection in Rio de Janeiro, Brazil. Of the 48 isolates genotyped using the SAG2 locus, 34 (70%) were of type I and 13 (27%) were of type III. No isolate of type II was recovered. Isolates from 1 chicken contained a type I and type III mixed infection, indicating natural multiparasite infection in the same animal. Cats fed mice infected with 11 type I strains shed 19–535 million oocysts in their feces, indicating that type I isolates can circulate in the environment.Keywords
This publication has 17 references indexed in Scilit:
- Prevalence of Toxoplasma gondii in commercial meat products as monitored by polymerase chain reaction – food for thought?International Journal for Parasitology, 2002
- Non-lethal infection parameters in mice separate sheep Type II Toxoplasma gondii isolates by virulenceComparative Immunology, Microbiology and Infectious Diseases, 2002
- Biological and genetic characterisation of Toxoplasma gondii isolates from chickens (Gallus domesticus) from São Paulo, Brazil: unexpected findingsInternational Journal for Parasitology, 2001
- Success and Virulence in Toxoplasma as the Result of Sexual Recombination Between Two Distinct AncestriesScience, 2001
- Unusual Abundance of Atypical Strains Associated with Human Ocular ToxoplasmosisThe Journal of Infectious Diseases, 2001
- Structures ofToxoplasma gondiiTachyzoites, Bradyzoites, and Sporozoites and Biology and Development of Tissue CystsClinical Microbiology Reviews, 1998
- Speculation on possible life cycles for the clonal lineages in the genus toxoplasmaParasitology Today, 1997
- Chronic Infection with Toxoplasma gondii Does Not Prevent Acute Disease or Colonization of the Brain with Tissue Cysts Following Reinfection with Different Strains of the ParasiteJournal of Parasitology, 1997
- Toxoplasma gondii Comprises Three Clonal Lineages: Correlation of Parasite Genotype with Human DiseaseThe Journal of Infectious Diseases, 1995
- Serological responses of equids fed Toxoplasma gondii oocystsEquine Veterinary Journal, 1987