Final answer:
The compression to ventilation ratio for an infant in a 1-person CPR scenario is 30:2, with 30 chest compressions followed by 2 rescue breaths.
Step-by-step explanation:
The ratio of compressions to ventilations in an infant 1-person CPR scenario is 30:2. This means that the rescuer should perform 30 chest compressions followed by 2 rescue breaths. Compressions should be done at a rate of 100 to 120 compressions per minute and at a depth of about 1.5 inches (4 cm). It's crucial to ensure that these steps are performed correctly to maximize the chances of successful resuscitation.