Final answer:
Children with parvovirus B19 are typically not contagious by the time they show symptoms such as a rash and can usually return to school once fever resolves and they feel well enough for normal activities.
Step-by-step explanation:
The condition described sounds like it pertains to parvovirus B19, colloquially known as 'fifth disease.' This is a common childhood viral illness. Typically, a child with parvovirus B19 is no longer contagious by the time they have visible symptoms like a rash. However, the decision on when to allow a child to return to school should be made by healthcare professionals and is usually based on the resolution of fever without the use of fever-reducing medications, and the child feeling well enough to participate in normal activities. The most contagious period is before the symptoms, especially the rash, develop, so when symptoms appear, the risk of transmission is significantly lower.