Final answer:
If a patient loses consciousness after receiving an immunization, the immediate actions to be taken are ensuring their safety, performing CPR if necessary, and addressing any severe allergic reactions.
Step-by-step explanation:
If a patient suddenly loses consciousness after receiving an immunization, it is crucial to act quickly and follow appropriate emergency protocols. The first step is to ensure the patient's safety by laying them flat on their back and checking for any signs of breathing or a pulse. If the patient is not breathing or has no pulse, immediate CPR should be initiated. In addition, if the patient is experiencing any severe allergic reactions, such as difficulty breathing or swelling of the face and throat, administering epinephrine and calling emergency medical services is necessary.