A virus is a small infectious agent that reproduces inside the living cells of any organism. They are too small that they cannot be observed through the eyes instead a microscope is needed. According to the records, there are five thousand viruses which infected humans. But the top ten most dangerous viruses that cause threat to your health are following:
1. Marburg Virus
Marburg Virus is the most dangerous virus in the world till now and it was identified by scientist in 1967. It is named after a small town on the river Lahn – but it has nothing to do with disease. It’s a hemorrhagic fever virus which causes high fever and bleeding of mucous membranes, organs and skin, which could lead to organ failure or death. The fatality rate of this virus is 90 percent.
2. Ebola Virus
There are five strains of the Ebola virus, named after countries and regions in Africa such as Reston, Tai Forest, Zaire, Sudan and Bundibugyo. The Zaire Ebola virus is the deadliest among these viruses. This virus is spreading more and scientist says that flying foxes bring this virus into cities. The Ebola virus is spread through contact with blood or any other blood fluid from infected people or animals. One strain about Ebola Reston is that it does not even make people sick. According to WHO, the fatality rate of Bundibugyo strain is 50 percent and 71 percent for Sudan strain.
3. Hanta Virus
The Hanta Virus is named after a river where American soldiers first thought to be infected with the Hanta virus during the Korean war in 1950. Hantavirus is transmitted to humans, not from any other person, but when they come in contact with urine, feces and saliva of infected mice and the symptoms include headache, fever, lung disease and kidney failure. In severe conditions, it could be life threatening, causing cardiovascular shock.
4. Bird Flu
This disease is viral in birds but it can be transmitted to humans.You can be infected through direct contact with poultry as most cases appear in Asia, because people often live close to chickens. The disease is caused by H5N1 virus which leads to failure of multi organs that are infected. This virus does not infect people, when they eat fully cooked chicken or eggs. Bird flu symptoms include fever, cough and nausea, but these symptoms can vary in humans causing eye infection.
5. Lassa Virus
Lassa virus causes Lassa fever, which is very severe and fatal. Thisvirus is carried or transmitted by rodents to humans. It also spread through equipment of a contaminated hospital because in most countries sterilization methods are hard to find as they cannot afford. This virus does not spread from one person to another person unless contact with body fluids occurs. According to the research of some scientist 15 percent rodents carry this virus in Africa.
6. Junin Virus
This virus takes its name from the city of Junin, where the first case of this disease reported in 1958. Junin virus is associated with Argentine hemorrhagic fever. This virus is transmitted by aerosolization and people infected with the virus suffer from skin bleeding, tissue inflammation and sepsis. It’s difficult to detect or identify this disease in the first instance due to its symptoms. The symptoms are caused by cytokines produced by sentinel cells of the immune system.
7. Crimea-Congo Fever
Crimea-Congo Fever was observed in Crimea in 1956 and this virus is widely distributed around the world. This acute viral disease in humans is caused by CCHF virus and its transmitted to large and small mammals by ticks. Immature ticks get this virus by feeding on infected small vertebrates and they remain infected their development. When they become mature, they transmit this infection to large animals. This disease is similar to Ebola and Marburg viruses, in the first days of this infection, bleedings starts on the face, pharynx and the mouth.
8. Machupo Virus
Machupo virus is also known as black typhus. It is spread through direct contact of particles of the virus. The virus spread due to dried urine of a mouse on the floors of homes into the air when you clean or inhale it. It is similar to Junin virus and it can be transmitted from one human to another human and even rodents carry it often. The symptoms of this disease are fever, headache, fatigue and arthralgia. Some people start having bleeding from their nose or some even start having loss of muscle control. The symptoms last for a week or a more than death occur within few days.
9. Kyasanur Forest Virus
Kyasanur Forest Virus was discovered in 1955 in woodlands on the southwestern coast of India. It is transmitted by ticks, but some scientist said that it’s hard to determine the carriers. According to another research, this was identified in 1957 when it was isolated from a sick monkey in Kyasanur. Till then four hundred to five hundred human cases were reported every year. Basically, this cannot be transmitted to person from another person, it’s transmitted to humans when a tick bites them. This disease can also be transmitted to large animals such as goats, cows and sheep after tick bite them and by this it can be easily transmitted to humans. The symptoms of this disease are strong headaches, muscle pain which causes bleedings which continue till three to four days.
10. Dengue Fever
Dengue Fever is also known as break- bone fever and it’s a constant threat. This disease is transmitted to humans when an infected female mosquito Aedes bites. This virus keeps circulating in human blood for seven days, it causes sufferers to have high fever, nausea and muscle/joint pain. In extreme cases, the disease can be life threatening because internal bleeding starts and experience low blood pressure. According to WHO, an estimate of 2.5 billion peoples is at risk of getting this fever.