A highly infectious and often fatal disease caused by a virus and characterized by fever, headache, and severe pimples that result in extensive scarring. Smallpox was once a dreaded killer of children and caused the deaths of millions of Native Americans after the arrival of European settlers in...
A lot of people still did not know about the existence of pathogenic agents, micro-organisms that cause disease like bacteria or viruses. However, they knew that illnesses could be contagious and passed from one person to another or from animal to animal and even to humans. They also knew ...
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Overview:Smallpoxis a highly contagious infection caused by the enveloped, doubled-stranded DNA virus smallpox, also known as variola virus (Figure 1). The virus ranges in size from 200 nm (nanometres) to 400 nm and possesses a genome that is 200 kilobase pairs long, making it one of ...
virus be released. The old vaccine had been a crude preparation produced on the skin of calves and would not meet the standards of a contemporary vaccine. After the 1980 declaration that smallpox had been eradicated, vaccination stopped everywhere and all production facilities were dismantled or ...
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Dr. Edward Jennerwas a medical doctor in England who developed the first smallpox vaccine. He created it in the year 1796 using biological matter taken from cowpox pustules, which are caused by thevaccina virus. Cowpox was a mild pox disease that was common during the 18th century, but no...
They are larger than some bacteria and contain double-stranded DNA. Poxviruses are the only viruses that do not need a cell's nucleus to replicate inside the cell. The variola virus is the only known cause of smallpox. The disease affects only humans. No animal reservoirs or insect ...
“A patient who used contact lenses and had a history of blunt trauma developed vaccinia keratouveitis after accidental ocular autoinoculation from a recent vaccination site. Corneal and conjunctival cultures were taken for bacteria, fungi, Acanthamoeba, and viruses. Viral-like cytopathic effects became...
Where and how does the variola virus (smallpox) grow? Where did measles originate? What is the history of smallpox? Where does leprosy come from? Where does tuberculosis come from? Where did influenza originate? Where does leprosy bacteria come from? Where did Ebola originate? What is the ...