  We present results from a deep mid-infrared survey of the Hubble Deep Field
South (HDF-S) region performed at 7 and 15 micron with the CAM instrument on
board the Infrared Space Observatory (ISO). The final map in each band was
constructed by the coaddition of four independent rasters, registered using
bright sources securely detected in all rasters, with the absolute astrometry
being defined by a radio source detected at both 7 and 15 micron. We sought
detections of bright sources in a circular region of radius 2.5 arcmin at the
centre of each map, in a manner that simulations indicated would produce highly
reliable and complete source catalogues using simple selection criteria.
Merging source lists in the two bands yielded a catalogue of 35 distinct
sources, which we calibrated photometrically using photospheric models of
late-type stars detected in our data. We present extragalactic source count
results in both bands, and discuss the constraints they impose on models of
galaxy evolution models, given the volume of space sampled by this galaxy
population.
