When Jon arrived home, Jon and Laura’s father arranged for both of his children to see Dr. Lyon, a medical doctor specializing in internal medicine. These specialists are commonly referred to as internists.

Dr. Lyon suspected immediately both Jon and Laura had acquired viral hepatitis. His suspicions were based on their physical examination and recent histories. John had lived in an area of the world where viral hepatitis is endemic, whereas Laura had been exposed to the risk of hepatitis through having her navel pierced under unknown conditions. Dr. Lyon then consulted with his colleague Dr. Smith, also an internist but with a specialty in diagnosing and treating infectious diseases. Dr. Smith also suspected both the Green siblings had acquired viral hepatitis. Jon was quite ill and his skin and whites of his eyes appeared more jaundiced.

Hepatitis A and B video