  Mid-infrared photometry of the hosts of Narrow-Line X-ray Galaxies at 6
microns and 12 microns has been attempted with ISOCAM. No conclusive detections
have been made. This implies that these are quiescent objects with little or no
active star-formation. Neither X-ray binaries nor starburst-driven superwinds
are consistent explanations for the X-ray emission in these objects. We
conclude that these NLXGs are predominantly AGN-powered.
