In other studies using peripheral blood mononuclear cells (PBMC) of patients with hyperprolactinemia revealed that exogenous recombinant human prolactin (rhPRL), as well as autologous shPRL from inactivated serum, significantly restricted intracellular growth of Toxoplasma in these cultures (Dzitko et al., 2012). Here, PRL is linked to hyperprolactinemia.