Erythema infectiosum Fifth disease

• Facts:
  Parvovirus B19
• History / PE:
  PRODROME
  None, fever is often absent or low grade
  
  RASH
  "Slapped cheek"
  Worsens with fever and sun exposure
• Complications:
  Arthritis
  Hemolytic anemia
  Aplastic crisis (eg. sickle cell, hereditary spherocytosis )
  Congential infection (fetal hydrops)
• Notes:
  "Slapped cheeks" are pathognomonic
  MCC of viral arthritis (look anti-B19 IgM)
• See Also:
  Viral exanthems