The hot-cold phenomenon is seen due to which toxin-: (A) Alpha lysin, (B) Beta lysin, (C) Gamma lysin, (D) Theta lysin
Answer is B. Beta hemolysin: is a sphingomyelinase hemolytic for sheep Blood cells but not for human or rabbit blood cells . It exhibits hot cold phenomenon the hemolysis being at 37degC but becoming evident only after chilling Ref: Ananthanarayan & paniker's Textbook of Microbiology 9th edition pg no 202