Providing clues into why the severity of a common parasitic infection can vary greatly from person to person, a new Johns Hopkins study shows that each one of three strains of the cat-borne parasite Toxoplasma gondii sets off a unique reaction in the nerve cells it invades.

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http://www.hopkinschildrens.org/Toxoplasmosis-The-Strain-Explains-Severity-of-Infection.aspx