I got this question:
Diphteria toxin is produced only by those strains of C. diphtheria that have which of the following characteristics?
- glucose fermenters
- lysogenic for b-prophage
- only mitis-strains
- sucrose fermenters
I think the right answer is lysogenic for b-prophage, since Freeman found out that toxic gene is encoded by lysogenic phage infecting all toxigenic strains in 1951. However, I am not sure what "b-" means in "b-prophage".
Which part is "b-" in Prophage?