Skin A patient presented with a vesicle on shin. Microscopy of Tzanck smear showed giant cells. Causative agent is: A Vaccinia virus B Varicella zoster C Mycobacterium D Molluscum contagiosum 💡 Explanation A patient presented with a vesicle on shin. Microscopy of Tzanck smear showed giant cells. Causative agent is: ✓ Correct Answer: B. Varicella zoster