How long after the onset of chicken pox sores can someone visit the infected individual?

The correct choice is based on the understanding of the contagious period for chickenpox. Chickenpox is caused by the varicella-zoster virus and spreads easily from person to person. An individual with chickenpox is considered infectious from about 1-2 days before the rash appears until all the chickenpox sores have crusted over.

The recommended guideline states that a person can safely visit someone who has chickenpox only after all the lesions have completely crusted over, which takes about five days after the onset of the sores. This ensures that the individual is no longer contagious and reduces the risk of spreading the virus to those who may be susceptible, especially in vulnerable populations such as pregnant women or individuals with weakened immune systems.

Other time frames provided do not accurately reflect the necessary precautions needed to prevent transmission of the virus. Visiting immediately or three days after the outbreak would still pose a risk of transmission. Likewise, waiting one week after the rash appears may not be adequate unless all sores have crusted over, which is crucial for final safety from contagion.