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*'''Black disease (Infectious Necrotic Hepatitis)''' - is caused by a toxin produced by ''Clostridium novyi'' type B. It is commonly associated with liver fluke infestation because:
 
*'''Black disease (Infectious Necrotic Hepatitis)''' - is caused by a toxin produced by ''Clostridium novyi'' type B. It is commonly associated with liver fluke infestation because:
**migrating flukes cause → liver necrosis, causing anaerobic conditions, and therefore clostridial multiplication, which leads to toxin production, causing disease.
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**migrating flukes → liver necrosis anaerobic conditions clostridial multiplication toxin production disease.
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