Coccidia are species specific (zoonotic implies transmission to man).
Ferrets have their own coccidia, which are not shared by dogs or cats,
which they frequently cohabit with.  Lizard coccidia may be infective to
other lizards, but your ferrets are spared infection.  Now your ferrets may
ingest the coccidial oocysts (eggs) and they can conceivably be identified
in the stool, but active infection will not occur.
 
With kindest regards,
Bruce H. Williams, DVM, DACVP
 
Join the Ferret Health List at
http://groups.yahoo.com/group/Ferret-Health-list
[Posted in FML issue 3406]