Top 10 deadly viruses in the world

   West Nile Virus

This virus is transmitted by various species of mosquitoes and can infect both human and animals. The virus was first found in a woman in the West Nile sub-region of the East African nation of Uganda in 1937. There was an outbreak of the virus in Romania in 1996 that saw a high number of cases with neuroinvasive disease and caused the deaths of 40 people. The virus became well-known when it spread to the United States in 1999.