Abstract
Between 1987 and 1991, the prevalence of IgG antibodies to Toxoplasma gondii was determined by ELISA in 28,247 serum samples belonging to 19,432 subjects of the area of Parma (Italy). The overall prevalence was 48.5%. The correlation of infection with age, performed on 420 sera, showed a significant increase of positivity until 30-40 approximately years. In consecutive sera obtained from 172 subjects, the IgG and IgM production was analyzed for about 8 months, and four different patterns were delineated which were comprehensive of the wide range of immunological responses to Toxoplasma gondii exposure observed. Among pregnant females the prevalence of anti-Toxoplasma gondii antibodies was 48.7%, and 5 cases of seroconversion during the pregnancy were observed (0.27%) from which two cases of congenital toxoplasmosis originated.
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