Smallpox
Early

The early or fulminant form of hemorrhagic smallpox (referred to as purpura variolosa) begins with a prodromal phase characterized by a high fever, severe headache, and abdominal pain. The skin becomes dusky and erythematous, and this is rapidly followed by the development of petechiae and bleeding in the skin, conjunctiva and mucous membranes. Death often occurs suddenly between the fifth and seventh days of illness, when only a few insignificant skin lesions are present. Some people survive a few days longer, during which time the skin detaches and fluid accumulates under it, rupturing at the slightest injury. People are usually conscious until death or shortly before. Autopsy reveals petechiae and bleeding in the spleen, kidney, serous membranes, skeletal muscles, pericardium, liver, gonads and bladder. Historically, this condition was frequently misdiagnosed, with the correct diagnosis made only at autopsy. This form is more likely to occur in pregnant women than in the general population (approximately 16% of cases in unvaccinated pregnant women were early hemorrhagic smallpox, versus roughly 1% in nonpregnant women and adult males). The case fatality rate of early hemorrhagic smallpox approaches 100%.
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