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Toxoplasma gondii virulence: changing pattern under different maintenance conditions
P Olliaro1, A Marchetti, A Regazzetti
1Istituto di Clinica delle Malattie Infettive, IRCCS S. Matteo, Università di Pavia, Italy.
Parassitologia
|December 1, 1993
Summary
Toxoplasma gondii virulence can increase with host passage. Initial isolation from a hare showed chronic infection in mice, but serial mouse-to-mouse transmission revealed progressive pathogenicity, highlighting host-parasite dynamics.
Area of Science:
- Parasitology
- Infectious Diseases
- Veterinary Pathology
Background:
- Toxoplasma gondii is an opportunistic protozoan parasite.
- Disseminated toxoplasmosis can be fatal in various hosts, including hares.
- Understanding parasite virulence factors is crucial for disease management.
Purpose of the Study:
- To investigate the virulence of Toxoplasma gondii isolated from a naturally infected hare.
- To assess the impact of host-parasite interactions on parasite pathogenicity.
- To evaluate the reliability of initial parasite isolation for predicting virulence.
Main Methods:
- Isolation of Toxoplasma gondii from hare organs and in vitro culture.
- Intraperitoneal inoculation of mice with isolated parasites or infected hare homogenate.
- Serial mouse-to-mouse passage to observe changes in virulence.
Main Results:
- Initial inoculation resulted in chronic infections in mice.
- Subsequent mouse-to-mouse transfections led to a progressive increase in parasite virulence.
- Virulence differences between isolates were not apparent without serial passage.
Conclusions:
- Host-parasite interactions significantly influence Toxoplasma gondii pathogenicity.
- In vitro and in vivo isolation methods may underestimate parasite virulence without serial passage.
- Repeated host passages are essential for fully characterizing parasite virulence potential.