Which active organisms does Metronidazole effectively treat?

Metronidazole is specifically effective against a range of protozoal infections and certain anaerobic bacterial infections. The organisms mentioned in the correct choice, T. vaginalis, E. histolytica, and G. lamblia, are all protozoa that Metronidazole effectively targets.

• T. vaginalis is a parasite that causes trichomoniasis, a common sexually transmitted infection.

• E. histolytica is responsible for amoebic dysentery and can cause severe gastrointestinal disease.

• G. lamblia, or Giardia lamblia, is known to cause giardiasis, leading to diarrhea and malabsorption.

Metronidazole works by disrupting the DNA of these organisms, inhibiting their growth and leading to cell death. This makes it a cornerstone treatment for infections caused by these specific protozoa. The clear indication of Metronidazole's efficacy against these organisms is foundational to its use in clinical settings for treating parasitic infections.