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Toxoplasma infection in pregnancy is usually treated with long‐term administration of the macrolide spiramycin to prevent fetal malformations. We had empirically observed that treated patients seldom developed pregnancy‐induced hypertension (PIH), a common and severe disorder of pregnancy whose aetiology and pathogenesis are still debated. Some clinical and experimental data suggest that infection could play a role in its development.

To test this hypothesis, we studied a cohort of 417 pregnant women treated with spiramycin because of seroconversion for Toxoplasma gondii and 353 low‐risk women who did not take any antibiotic during pregnancy. PIH was defined as blood pressure >140/90 mmHg on two or more occasions, occurring after 20 weeks of gestational age.

Seventeen (5.2%) women in the control group developed PIH compared with two (0.5%) in the case group …