The nitroimidazole antimicrobial agent widely used as the first-line oral treatment for *Trichomonas vaginalis* infection is _____.
Answer
metronidazole
Explanation
The source names **metronidazole** as antibiotic therapy, with treatment of secondary infection also noted. The question asks for the named antibiotic, not the full treatment plan. **Key takeaway:** Metronidazole is the antibiotic specifically stated in the slide.\n\n**Glossary:** **Antibiotic**: a medicine used to act against bacteria.