Which virus is known to potentially cause severe fetal outcomes if contracted during pregnancy?

Human parvovirus B19 is a significant concern during pregnancy because it is associated with serious fetal outcomes. When a pregnant individual contracts this virus, it can lead to complications such as fetal anemia, hydrops fetalis (a condition where excess fluid accumulates in the fetus), and even miscarriage in severe cases. This is particularly concerning during the first trimester and around the time of fetal organ development.

In contrast, while HIV does pose risks during pregnancy, such as the potential for transmission to the baby, it is often manageable with proper healthcare interventions. Rhinovirus, primarily known for causing common colds, typically does not lead to severe outcomes for the fetus. Similarly, the common cold virus itself usually results in mild symptoms and is not linked with significant fetal risk.

Thus, the association of human parvovirus B19 with more severe outcomes for the fetus highlights its importance as a concern during pregnancy, making it the correct choice in this scenario.