Which infection is identified by a cytological smear revealing multinucleated giant cells, syncytial formation, and nuclear ballooning degeneration?

Explanation

The presence of multinucleated giant cells, syncytium, and ballooning degeneration of the nucleus in a cytological smear is a hallmark of herpes simplex virus infection. These cellular changes are not typically observed in erythema multiforme, recurrent aphthous stomatitis, or Coxsackie virus infection.