Final answer:
Encourage family members to remain at the bedside.
Step-by-step explanation:
The nursing action that will be included in the plan of care for a 42-year-old patient with bacterial meningitis who is disoriented and anxious is to encourage family members to remain at the bedside. This is important because having familiar faces and emotional support can help alleviate anxiety and improve the patient's overall well-being. The presence of family members can also help with orientation and provide a sense of security.