According to the [[Centers for Disease Control and Prevention]], [[Hepatitis D]] "is a defective virus that needs the [[Hepatitis B]] virus to exist.
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According to the [[Centers for Disease Control and Prevention]], '''Hepatitis D''' "is a defective virus that needs the [[Hepatitis B]] virus to exist.
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Hepatitis D virus (HDV) is found in the blood of persons infected with the [[virus]]."<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#h</ref>
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Hepatitis D virus (HDV) is found in the blood of persons infected with the [[virus]]."<ref>https://www.cdc.gov/vaccines/about/terms/glossary.htm#h</ref>