Brief Answer:
Inflammatory diarrhea.

Detailed Answer:
Hello and Welcome to 'Ask A Doctor' service.
I have reviewed your query and here is my advice.

White blood cells are immune system cells that can show up in the stool if you have inflammatory diarrhea. This type of diarrhea may be a symptom of an infection caused by bacteria such as shigella, Clostridium difficile, campylobacter, or salmonella.Protozoans are rarely involved.

Suggestions,
Stool culture and sensitivity should be done to rule out the name of bacteria involved and antibiotic has to pe started accordingy.
Flagyl covers protozoa's but not bacteria's.
So my suggestion is take a broad sprectrum antibacterial like Ciprofloxacin 500 twice daily for 5 days with flagyl 400 mg thrice daily(full coverage).
Hope i was helpful.
Thanks!

---

Brief Answer:
welcome.

Detailed Answer:
Hope i was helpful.
Do rate the answer please,
Get well soon.

---