During neonatal resuscitation, which one of the following medications is indicated initially if the heart rate of the newborn continues to be less than 60 beats per minute after 30 seconds of effective Positive Pressure Ventilation (PPV) and coordinated Chest Compressions?

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?