**1. Introduction**

*Toxoplasma gondii* infection affects a third of the world's population. Although in people with a healthy immune system it does not cause disease and it is usually asymptomatic, in pregnancy and immunosuppressed patients it can cause serious side effects.

In pregnancy, congenital toxoplasmosis may cause severe consequences to the fetus, from death in uterus to late important clinical conditions such as cognitive impairment, blurry vision by inflammation of the retina, deafness, epilepsy, seizures, tuberculosis, *Pneumocystis jiroveci* pneumonia, or poor coordination.

In primary or secondary immunosuppressed patients who get *Toxoplasma gondii* infection, or a reactivation of the disease, unwanted sequelae can also occur [1–4].

Laboratories should play an important role. "The important role of laboratories" should be getting involved and assuming the commitment not only in the diagnosis, but also in the prevention. They must bridge the gap between the attending physician and patients.
