Which of the following is NOT a common agent causing viral exanthems?

Viral exanthems are rashes associated with viral infections, commonly seen in children. The agents typically responsible for viral exanthems include a variety of viruses known for causing these specific skin manifestations.

Human herpesvirus 6, parvovirus B19, and Coxsackie virus are all known to cause viral exanthems. Human herpesvirus 6 is associated with roseola, which manifests as a sudden rash following a high fever. Parvovirus B19 is the causative agent of fifth disease, also known as “slapped cheek syndrome,” characterized by a distinctive facial rash. Coxsackie virus can result in herpangina and hand, foot, and mouth disease, both of which are linked with rashes.

Streptococcus pneumoniae, on the other hand, is a bacterium known for causing pneumonia, meningitis, and other infections, but it does not cause viral exanthems. It belongs to a different class of pathogens and is not associated with the characteristic rashes seen in viral infections. Thus, identifying Streptococcus pneumoniae as the choice not related to viral exanthems aligns with the definitions of the conditions involved.