Pseudo Membranous Typhlocolitis

Ostrich chicks affected between 4-14 days. Acute death - alert to depressed within 1 hour dead within another 1 hour. PM severe toxaemia with the pseudomembranous typhlocolitis. serosal petechia, mild splenomegally, no other significant lesions. Response to antibiotics vary tremendously from good to none at all. Antibiotics used:Tylosin/ Fosbac/ Enrofloxacin/ Sulfa's. If chicks are not better and condition reoccurs - usually with severe diarrhea, there is no response to any of the antibiotics. Culture