A 6-year-old Friesian cows has developed a mass on the left…
A 6-year-old Friesian cows has developed a mass on the left jaw region. The farmer reports that it developed over the last several weeks. The mass is firm, immobile, and painful on manipulation. While assisting the veterinarian, you notice a thick granular discharge coming from the mass. The veterinarian suspects “lumpy jaw,” Which is caused by which of the following agents?