[From the historical background of Toxoplasma gondii to the sero-immunological interpretation of the 30-yr results of a longitudinal study of newborn infants until 96 months of age].

The Author's study ranges from the historical background of Toxoplasma gondii to our current biological knowledge and the role of Toxoplasma gondii in pathology and human infection. The Author has considered the diagnosis--always problematic from the interpretative point of view--and, on the basis of his own long and extensive research, suggests the usefulness of a comparison with the results obtained from the dye test findings observed in longitudinal surveys of new born up to a maximum age of 96 months. The Author believes that these results can represent an element of comparison for the purpose of prognosis, therapy and prophylaxis, and above all, in sedation to combat anxiety states, and banal preoccupations.