Multiple choice Which of the following is the causative agent of swamp cancer (especially in horses)? Conidiobolus coronatus Pythium insidiosum Basidiobolus ranarum Apophysomyces elegans Shizophyllum Reveal answer Fill a bubble to check yourself B Correct answer Explanation Pythium insidiosum is the causative agent of swamp cancer (especially in horses), mainly in wet tropical environments. Infections are characterised by tumour-like masses, which develop mostly on the legs.