Answer:
a) Patient self-reported case of chickenpox
Explanation:
Varicella, or chickenpox, is an infectious disease caused by the varicella-zoster virus. Highly contagious but usually benign, it was one of the most common childhood illnesses before the advent of the vaccine. Once acquired the virus, the person is immune for life. However, it will remain in the body and in the future may cause a condition known as herpes zoster, or shingles. Because of this immunity, we can conclude that adequate evidence of varicella immunity, indicating that administration of varicella vaccine is unnecessary is a case reported by the chickenpox patient.
