“Hepatitis D virus and hepatitis E virus. Hepatitis D virus infection always occurs with hepatitis B infection, either with a chronic hepatitis B infection (superinfection) or as two simultaneous new infections (coinfection).Reports are rare. Cases of hepatitis D are typically associated with injection drug use. Cases of hepatitis E are typically travel associated.  Humans are the reservoir for hepatitis D, which is usually transmitted by contact with blood or body fluids, particularly sharing drug paraphernalia. Humans and animals (swine) are the reservoir for hepatitis E which is transmitted most commonly through fecal contaminated food, water, and environment.”

Washington State Dept of Health (https://doh.wa.gov/public-health-healthcare-providers/notifiable-conditions/hepatitis-d-and-e)