AIDS is not transmitted to humans by animal bites, excepting possibly (but
not for certain) certain monkeys/apes that are genetically far more like
humans than ferrets are.  Ferrets can't get human AIDS and they can't
give it oto humans.
 
There is something else to think about, though.  A person who is HIV
positive is going to die, usually within less than ten years of becoming
infected.  As you know, there are no cures for AIDS, and the medicines now
available only delay death, and perhaps help lessen the suffering a little.
Treatment for the illnesses that happen to AIDS patients is expensive.
For an HIV positive person, the descent into illness and the knowledge of
impending death is a terribly stressful time for that person, as well as
those around him.  In time, this ferret breeder will become too sick to
care for his ferrets.  He is unlikely to realize, for a time, that he isn't
able to care for them any longer, and during that period the ferrets will
probably be exposed to some degree of neglect.  For example, there may be
jills that haven't been bred in too long.  Or the breeder may have had to
cut down on expenses (AIDS is horribly expensive) and the ferrets may have
had a poor diet.  They'll need rehabilitation, new homes, and may need
medical care.  This is where you may be able to perform a considerable
humanitarian service, to the ferrets and to the breeder.
[Posted in FML issue 3329]