Rodent models of infection involving lipopolysaccharide (LPS; a model of bacterial infection) or polyinosinic-polycytidylic acid (a model of viral infection) injections during pregnancy have demonstrated reductions in placental abcb1a and abcb1b mRNA (translated into P-gp) expression, suggesting reduced fetal protection against xenobiotics [2], [26], [27]. This evidence concerns the gene PGP and infection.