<prompt> Which of the following viruses cause an acute febrile rash and produces disease in immunocompetent children but has been associated with transient aplastic crises in persons with sickle cell disease?RubellaVaricella- zosterParvovirusRubella  <response>: Parvovirus B 19 is the causative agent of erythema infectiosum fifth disease. It is associated with transient aplastic crisis in persons with hereditary hemolytic anemia. In adults, it is also associated with polyahralgia. 