The leukaemogenic effect of irradiation associated with toxoplasmosis was studied. Rats were infected with Toxoplasma gondii RH strain 3 weeks prior to irradiation. The leukaemic effect of irradiation was aggravated by toxoplasmosis as leukaemia appeared in 10% of 300 cGy irradiated rats and in 30% of 500 cGy irradiated ones, six months after irradiation.
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