What is the viral cause of the “slapped cheek” appearance and lacy reticular rash in a child?

The viral cause of the “slapped cheek” appearance and lacy reticular rash in a child is Parvovirus B19. This virus is known to cause an illness commonly referred to as fifth disease or erythema infectiosum, which primarily affects children. Upon initial infection, symptoms often begin with mild flu-like signs such as fever and sore throat, but as the infection progresses, the characteristic rash appears.

The “slapped cheek” appearance is particularly striking in children, where bright red cheeks are prominently displayed, often accompanied by a lacy, reticular rash on the trunk and limbs that can develop a few days later. This unique presentation is a key clinical indicator that helps differentiate it from other childhood rashes.

In contrast, other viral illnesses such as measles, rubella, and varicella-zoster present with different rashes and associated symptoms. Measles typically causes a confluent rash that starts at the hairline and spreads downwards, often accompanied by a high fever and Koplik spots. Rubella, while also presenting with a rash, usually has a more subtle appearance and is associated with mild fever and lymphadenopathy. Varicella-zoster virus causes chickenpox, characterized by vesicular lesions that are