The expression of virulence factor is optimal at 39 °C, and is controlled by a transcriptional activator, PrfA, whose expression is thermoregulated by the PrfA thermoregulator UTR element.
A expresión do factor de virulencia é óptimo a 39 °C, e está controlado por un activador transcricional chamado PrfA, cuxa expresión está termorregulada polo elemento UTR termorregulador PrfA.