The nurse is providing teaching to the parents of a child with varicella. Which statement indicates that the parents have understood the instructions?

Choice A rationale Varicella, or chickenpox, is caused by a virus, and therefore antibiotics are completely ineffective for treatment or reducing contagiousness. The child must be isolated until all lesions have scabbed over, which indicates the end of the contagious period. Returning to school based on starting an antibiotic regimen shows a misunderstanding of the required isolation period. Choice B rationale While good hand hygiene is generally important for preventing the spread of many diseases, the primary mode of transmission for varicella is airborne or direct contact with vesicular fluid. The main method of contagion control is strict isolation until all lesions are fully crusted over, not just frequent hand washing, making this statement incomplete for effective prevention. Choice C rationale The varicella vaccine is highly effective, but it does not offer 100 percent protection. Breakthrough infection can occur, though it is often a milder case. Therefore, the statement that the sister "can't catch it" is scientifically inaccurate and creates a false sense of security, showing the parents need further education on vaccine efficacy and breakthrough risk. Choice D rationale Acetaminophen is the recommended antipyretic for fever associated with varicella. Crucially, salicylates (aspirin) must be avoided due to the significant risk of Reye's syndrome, a serious and potentially fatal condition involving liver and brain swelling. Selecting acetaminophen confirms that the parents understand the correct and safe method for fever management.