Toxoplasmosis in England.  II.  Variation factors in the pathogenesis of Toxoplasma infections:  the sudden increase in virulence of a strain after passage in multimammate rats and canaries.
D000818:Animals; D002171:Canaries; D004739:England; D051381:Rats; D014122:Toxoplasma; D014123:Toxoplasmosis; D014774:Virulence
TOXOPLASMOSIS/experimental