Smallpox

Smallpox was an infectious disease caused by one of two virus variants, Variola major and Variola minor. The agent of variola virus (VARV) belongs to the genus Orthopoxvirus.  The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980. The risk of death after contracting the disease was about 30%, with higher rates among babies. Often those who survived had extensive scarring of their skin, and some were left blind.

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24 Most Dangerous and Deadly Viruses

Cover Image For List : 24 Most Dangerous And Deadly Viruses

Viruses are acellular microorganisms that can only grow offspring in living cells. They are formed by consisting of nuclear acids and proteins, outside the body they are dead-like but are alive inside the body. They can be assembled as crystals.A virus cannot reproduce without any live medium. It can remain dormant for hundreds of years…