Abstract
SUMMARY: Sera received from subjects suspected of toxoplasmosis were examined for hæmagglutinating antibodies and compared with sera from an apparently normal population.In cases of chorio‐retinitis, a significantly higher than normal proportion of positive results was demonstrated in all age groups. The results also suggest that in children and young adults infection with Toxoplasma may be a far from rare cause of disease of the reticulo‐endothelial system.

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