The Hepatitis E reference article from the English Wikipedia on 24-Apr-2004
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Hepatitis E

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Hepatitis E is a contagious virus that causes acute (non-chronic) hepatitis.

It is spread via the Fecal-oral route, typically by contamination of water supplies.

It consists of a single strand of non-enveloped RNA, about 33 nanometers in length. It is currently classified as a Caliciviridae. However, genomically, it more closely resembles the rubella virus and may in the future be reclassified.

Clinically, hepatitis E is comparable to hepatitis A, but in pregnant women the course can be fulminant.