All of the following infections are often associated with acute intravascular hemolysis, except:
Clostridium tetani acts by releasing 'tetanospasmin' which acts by blocking neurotransmitter release (It has no role in haemolysis). Ref: Harrison's Principles of Internal Medicine, 15th Edition, Page 690
Clostridium tetani
Baonella bacilliformis
Plasmodium falciparum
Babesia microti