Bacterioscopic examination of a smear from the pharynx of a diphtheria suspect revealed bacilli with volutine granules. What etiotropic drug should be chosen in this case?

Answer options

1. Interferon
2. Diphtheritic anatoxin
3. Eubiotic
4. Bacteriophage
5. Antidiphtheritic antitoxic serum

Explanation

Etiotropic drugs deals directly with the etiological factor (diphtheria toxin). Antidiphtheric antitoxic serum neutralizes the toxin of diphtheria and is employed both as a curative and as a prophylactic agent.