Tags: Disease.
Hemorrhagic smallpox sometimes called bloody pox fulminant smallpox and blackpox is a severe and rare form of smallpox and is usually fatal. Like all forms of smallpox it is caused by the variola virus. It is characterized by an incubation period of 7 to 14 days. It has two stages the first begins with fever headache chills nausea vomiting and severe muscle aches. The skin flushes in a deep-purple uneven pattern across the face. The early stage is often mistaken for measles.