A nurse is providing care to a parent of a child who has varicella. Which of the following statements should the nurse include in the teaching?

A. A negative titer is used to determine immunity, not the infectious period. It does not indicate when the child is no longer contagious. B. Fever may subside before the lesions have fully crusted, so relying on fever alone is insufficient to prevent transmission. C. Varicella (chickenpox) is highly contagious. Children are considered infectious from 1–2 days before the rash appears until all lesions have crusted over. Returning to school before crusting can spread the virus to others. D. Antibiotics do not treat viral infections like varicella. The child may still be contagious even after starting antibiotics.