A 14-year-old child has been admitted with complaints of fever, headache, chills, and vomiting. He is provisionally diagnosed with bacterial meningitis and a lumbar puncture is performed. Which cerebrospinal fluid (CSF) variation will confirm bacterial meningitis?

You are assessing a 7-month-old infant. Which of the following findings would be considered the most significant red flag for neurological dysfunction?

A 5-year-old child is exposed to measles at school. The healthcare provider recommends administration of the measles vaccine within 72 hours. Which immunoprophylactic principle is being applied in this scenario?