FBI estimated cleanup and repair costs at $80 million. Melissa: The most dangerous computer virus in 1999, Melissa sent copies of itself that looked like NSFW pics.Explorezip: This worm used fake emails to spread to every machine on thousands of local networks.Sircam: A computer worm from 2001 that used counterfeit emails with the subject line, “I send you this file in order to have your advice.”.Tanatos/Bugbear: A 2002 keylogger virus that targeted financial institutions and spread to 150 countries.Storm Worm: This worm showed up in 2007 and attacked millions of computers with an email about approaching bad weather.Its financial cost has been pegged at $10.4 billion, but not reliably. Swen: Written in C++, the Swen computer worm disguised itself to look like a 2003 OS update.Yaha: Yet another worm with several variants, thought to be the result of a cyber-war between Pakistan and India.Mimail: This worm tried to harvest data from infected machines to launch a string of DDoS attacks, but was relatively easy to remove.Here are just a few more viruses that have wreaked havoc over the years: With a million new malware programs popping up every 3 years, we may miss the forest for a few outstanding trees. But it's more of a problem for the 2 billion people who live in areas that are threatened by dengue fever.The top 10 worst computer viruses above are just the ugly tip of a gargantuan digital iceberg. Transmitted by mosquitoes, dengue affects between 50 and 100 million people a year in popular holiday destinations such as Thailand and India. If you're planning a holiday in the tropics, get informed about dengue. Dengue feverĭengue fever is a constant threat. People infected with the virus suffer from high fever, strong headaches and muscle pain which can cause bleedings. It is assumed that rats, birds and boars could be hosts. It is transmitted by ticks, but scientists say it is difficult to determine any carriers. Scientists discovered the Kyasanur Forest Virus (KFD) virus in woodlands on the southwestern coast of India in 1955. The virus can be transmitted from human to human, and rodents often the carry it. It progresses similar to the Junin virus. The infection causes high fever, accompanied by heavy bleedings. The Machupo virus is associated with Bolivian hemorrhagic fever, also known as black typhus. During the first days of infection, sufferers present with pin-sized bleedings in the face, mouth and the pharynx. It is similar to the Ebola and Marburg viruses in the way it progresses. The Crimea-Congo fever virus is transmitted by ticks. The Marburg virus under a microscope Image: Bernhard-Nocht-Institut 7. The problem is that the symptoms can appear to be so common that the disease is rarely detected or identified in the first instance. People infected with the virus suffer from tissue inflammation, sepsis and skin bleeding. The Junin virus is associated with Argentine hemorrhagic fever. Spy assassinations: The top five deadly poisons Scientists assume that 15 percent of rodents in western Africa carry the virus. Cases can be endemic - which means the virus occurs in a specific region, such as in western Africa, and can reoccur there at any time. Lassa virusĪ nurse in Nigeria was the first person to be infected with the Lassa virus. It is said this explains why most cases appear in Asia, where people often live close to chickens. You can only be infected through direct contact with poultry. But in fact the risk of contracting the H5N1 strain - one of the best known - is quite low. The various strains of bird flu regularly cause panic - which is perhaps justified because the mortality rate is 70 percent. Symptoms include lung disease, fever and kidney failure. It is named after a river where American soldiers were first thought to have been infected with the Hantavirus, during the Korean War in 1950. The Hantavirus describes several types of viruses. Scientists say flying foxes probably brought the Zaire Ebola virus into cities. It is the strain currently spreading through Guinea, Sierra Leone and Liberia, and beyond. The Zaire Ebola virus is the deadliest, with a mortality rate of 90 percent. There are five strains of the Ebola virus, each named after countries and regions in Africa: Zaire, Sudan, Tai Forest, Bundibugyo and Reston. As with Ebola, the Marburg virus causes convulsions and bleeding of mucous membranes, skin and organs. The Marburg virus is a hemorrhagic fever virus. It is named after a small and idyllic town on the river Lahn - but that has nothing to do with the disease itself. The most dangerous virus is the Marburg virus.
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