Hi Randy,
 
I've never had ferrets that had this. I can tell you what my medical
books for *HUMANS* have to say on it. []'s are my comments.
 
1998 Current Medical Diagnosis & Treatment, p 576
 
   Eosinophilic Gastritis.
   This is a rare disorder in which eosinophils infiltrate the antrum
   [part of the stomach] and sometimes the proximal intestine.
   Infiltration may involve the mucosa, muscularis, or serosa [tissue
   layers of the intestinal wall].  Peripheral eosinophilia [large
   numbers of a certain kind of white blood cell] is prominent.
   Symptoms include anemia from mucosal blood loss, abdominal pain,
   early satiety [you feel full earlier than usual], and postprandial
   vomiting [vomiting after eating meals].  Treatment with
   corticosteroids is beneficial in a majority of patients.
 
The Merck Manual, 17th ed., p 767
 
   Eosinophilic gastritis, a condition with extensive infiltration of
   the mucosa (and occasionally the full stomach wall thickness) with
   eosinophils, often involving the antrum and intestine, may result
   from nematode infestation.  If pyloric obstruction occurs and
   steroids are ineffective, surgery may be required.
 
I hope little Oakley's blood tests come out negative... I'll light a
candle for him.
 
Best wishes,
Megan
--
Megan O'Shaughnessy, D.C.
[Posted in FML issue 2534]