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Four orthopoxviruses cause infection in humans: variola, vaccinia, cowpox, and monkeypox. Variola virus infects only humans in nature, although primates and other animals have been infected in an experimental setting. Vaccinia, cowpox, and monkeypox viruses can infect both humans and other animals in nature. [33]
Smallpox is an acute contagious disease caused by the variola virus, a member of the orthopoxvirus family. It was one of the most devastating diseases known to humanity and caused millions of deaths before it was eradicated.
5 sie 2022 · Smallpox is caused by the variola virus. The virus can spread: Directly from person to person. You can catch the smallpox virus by being around someone who has it. An infected person can spread the virus when they cough, sneeze or talk. Coming in contact with skin sores also can cause you to get smallpox. Indirectly from an infected person.
28 cze 2016 · Smallpox is an ancient disease caused by the variola virus. Early symptoms include high fever and fatigue. The virus then produces a characteristic rash, particularly on the face, arms and legs.
7 cze 2016 · Before smallpox was eradicated, it was a serious infectious disease caused by the variola virus. It was contagious—meaning, it spread from one person to another. People who had smallpox had a fever and a distinctive, progressive skin rash. Most people with smallpox recovered, but about 3 out of every 10 people with the disease died.
The variola virus causes smallpox. There are two variants of variola: variola major and variola minor (or variola alastrim). Variola major caused most cases of smallpox and the most deaths.
The variola virus is a large, brick-shaped, double-stranded DNA virus that serologically cross-reacts with other members of the poxvirus family, including ectromelia, cowpox, monkeypox,...