A patient presents with symptoms of abdominal pain, diarrhea, and fever. Laboratory results indicate elevated white blood cell count and stool testing positive for pathogens. What is the most appropriate initial nursing intervention?

Implement strict isolation precautions to prevent transmission.

Administer antidiarrheal medications to reduce symptoms.

Provide a bland diet to ease gastrointestinal distress.

Initiate intravenous fluid replacement to prevent dehydration.