Relieves the repression of host cell immune response genes (interferon-stimulated genes) by blocking the recruitment of host BAHD1 to these genes. May modulate interferon-mediated immune response to control bacterial colonization of the host. Interacts specifically with host BAHD1. Induced in infected host cells. Expression is regulated by PrfA and sigma-B factor (SigB). Deletion of lntA leads to a decrease in bacterial colonization of spleens and livers, as well as blood bacteraemia.