Final answer:
Penicillin is the antibiotic commonly used to treat Erysipelas in animals due to its broad-spectrum efficacy against gram-positive bacteria. While tetracycline and chloramphenicol also have broad antibacterial applications, penicillin is specifically preferred for Erysipelas.
Step-by-step explanation:
When treating Erysipelas in animals, penicillin is often the antibiotic of choice. This is because penicillin is frequently effective against the type of bacteria that typically cause Erysipelas, providing a broad-spectrum antibacterial coverage. Notably, penicillin is significantly used for treating various bacterial infections due to its efficacy against gram-positive bacteria and in combating bacteria like Clostridium diphtheriae, as referenced in the brief regarding C. diphtheriae infections. While antibiotics such as erythromycin and tetracycline can control certain bacterial infections, the key to addressing Erysipelas lies in penicillin's ability to treat this specific condition in animals.
Other antibiotics listed, including tetracycline, chloramphenicol, and nitroimidazole, have their respective uses in the treatment of different bacterial infections. For instance, tetracycline is a broad-spectrum antibiotic with a wide range of antimicrobial activity and is often used to treat conditions such as Lyme disease, cholera, and other infections. Chloramphenicol is effective against serious infections but is less frequently used due to its potential toxicity to bone marrow cells. However, for Erysipelas, the recommended antibiotic remains penicillin.