Hi Carol, You won't find a worm... it is in fact a fungal infection which attacks ferrets ( or cats) with low immune systems. It can be spread through contact I am told though when we had cats get it immediately after a vaccination... it did not spread to the others here. Our treatment was a lyme dip for the cats... it passes over time, as the immune system builds back up. not sure what the cefa drops are for.??? . amoxy certainly does not help as it is not a bacterial infection. [Posted in FML 6458]