Which client assignment should be avoided by a nurse who is pregnant?

The assignment for a nurse who is pregnant that should be avoided is caring for a 9-year-old client with parvovirus B-19 infection. Parvovirus B-19 poses specific risks to pregnant women and their fetuses, particularly during the first and second trimesters. The virus can lead to serious complications, such as fetal anemia or hydrops fetal, making it particularly concerning for a pregnant nurse.

While other clients may present challenging situations or require careful handling, such as different age groups and medical conditions, they do not carry the same degree of risk to the pregnant nurse. For example, a combative toddler or a dehydrated child with a sore throat may demand physical interventions but don't pose infectious risks to the nurse or her pregnancy. Similarly, the young patient with leukemia, while requiring sensitive care, does not have a contagious condition like parvovirus. Hence, the risk of contracting or transmitting parvovirus makes assignment C the most critical to avoid in this scenario.