NBCSN Nationally Certified School Nurse Practice Exam

When is chicken pox considered communicable?

1. From 1-2 days before rash until it crusts

2. 1-2 days before and 4-5 days after rash onset

3. From rash onset to 1 week after

4. Only during the active rash phase

The correct answer is: 1-2 days before and 4-5 days after rash onset

Chicken pox is considered communicable from 1-2 days before the rash appears until about 4-5 days after the rash onset. This period encapsulates when the virus can be transmitted to others, which is crucial for controlling outbreaks and ensuring that individuals who are susceptible, such as those who have never had chicken pox or have not been vaccinated, are protected. The infectious period begins before the rash, as the virus can be present in the respiratory secretions of an infected individual even before any visible symptoms are apparent. This pre-rash communicability is vital for public awareness and prevention strategies, as individuals may not realize they are contagious without an evident rash. Additionally, the contagious period extends up to several days after the rash appears, until all the blisters have crusted over. This ensures that anyone exposed during this time could potentially develop the disease. Understanding this timeline is essential for school nurses and healthcare providers in managing exposures and educating families about the importance of reporting cases to prevent further transmission.