<prompt> A child has fever with redness of cheek. The causative organism fohis condition is:Herpes virusParvovirus B-19AdenovirusRubella  <response>: Ans. B Parvovirus B-19Exanthema infectiosum:The characteristic rash first appears as erythematous flushing on the face in a slapped cheek appearance red cheek.The most common manifestation of parvovirus B19 is erythema infectiosum, also known as fifth disease, which is a benign, self-limited exanthematous illness of childhood.It was the 5th in a classification scheme of common childhood exanthems.The preceding 4 exanthems were measles, scarlet fever, rubella, and Filatov-Dukes disease an atypical scarlet fever, with roseola infantum as the sixth disease 