Human struggle against the virus had begun long before our species to have evolved into a perfect modern form. For some diseases caused by viruses, there are vaccines and antiviral drugs that can prevent the spread of the disease is more widespread. In fact, smallpox has been successfully eradicated. However, ebola outbreak that occurred in West Africa shows that our war against the virus is far from over.
The virus that triggered the epidemic, Ebola Zaire, killing up to 90 percent of infected people and families make difficult Ebola destroyed. Ebola is deadly, but actually out there are still many other viruses that are even more dangerous. See explanation Elke Muhlberger, ebola virus expert and professor of microbiology at the University of Boston.
Here are 9 harmful viruses on Earth is based on a person's risk of death if infected and the large number of deaths and people who are threatened by this virus.
Scientists identify Marburg virus in 1967, when a small outbreak occurred among laboratory workers in Germany who come into contact with monkeys imported from Uganda.
Marburg virus similar to Ebola that both can cause high fever and bleeding. This means that people who are infected will develop a high fever and bleeding throughout the body which can lead to shock, organ failure and death.
The death rate when the first outbreak was 25 percent, but the figure rose to 80 percent in the 1998-2000 outbreak in the Democratic Republic of Congo, and in 2005 the plague befell in Angola, according to the World Health Organization (WHO).
Ebola outbreak first in humans occurs simultaneously in Sudan and the Democratic Republic of Congo in 1976. Ebola is transmitted through contact with blood, body fluids, or tissues of infected persons or animals ebola One virus, Ebola Reston, does not make people sick. But for viruses Bundibugyo, the rate of death by 50 percent and increased to 71 percent for Sudan virus, according to WHO.
Although rabies vaccine for pets that were introduced in 1920 have made this infection is rare in developed countries, but rabies is still a serious problem in developing countries, including Indonesia. "
This virus is a disease and brain damage that bad. But we have the anti-rabies vaccine, and we have worked antibodies against rabies, so if someone was bitten by a rabid animal we can heal this," he said. However, without treatment a person can die.
In the modern world, HIV still be one of the biggest killers. An estimated 36 million people have died of HIV since the disease was first recognized in the early 1980s. "Infectious diseases are the most adverse impact on mankind today is HIV," said Dr.Amesh Adalja, infectious disease expert.
Strong antiviral drugs has made it possible for people to live for years with HIV. But this is still a killer disease in low and middle income countries, where HIV infection occurs by 95 percent. Nearly 1 out of every 20 adults in sub-Saharan Africa are HIV-positive, according to WHO.
In 1980, the World Health Assembly declared the world has been free from smallpox. But before that, the human struggle against smallpox for thousands of years and the disease killed an estimated 1 out of 3 people infected. Victims are still able to survive with the survivors suffered permanent injuries and usually blindness.
Hantavirus pulmonary syndrome (HPS) received widespread attention in the United States in 1993, when a young man who initially healthy is Navajo and his fiancee lived in the Four Corners area of the United States, died within a few days while experiencing shortness of breath.
The virus is not transmitted from one person to another, but the people contracted the disease from exposure to feces of infected mice. Previously, different hantavirus causing outbreaks in the early 1950s, during the Korean War. More than 3,000 soldiers are infected and about 12 percent of them died.
According to WHO, during the flu season about 500,000 people worldwide die from the disease. But sometimes, when a new flu virus appears to be a pandemic and the number of higher death.
The most deadly flu pandemic, sometimes called the Spanish flu, started in 1918 and caused pain in 40 percent of the world's population and killed an estimated 50 million people. Experts are now worried about the emergence of a new influenza virus that can spread quickly among human.
Dengue virus first appeared in 1950 in the Philippines and Thailand, and has since spread throughout the tropical and subtropical regions around the world. Approximately 40 percent of the world's population now live in areas where dengue is endemic, and the mosquito-borne disease is likely to spread further.
According to the WHO, dengue fever affects 50 to 100 million people per year. Although dengue fever death rate lower than some other viruses, by 2.5 percent, the virus can cause shock condition, the same as that experienced by patients with Ebola.
There is no vaccine to prevent dengue fever, but clinical trials of experimental vaccines developed by the French drug maker, Sanofi has promising results.
Two vaccines are available to protect children from rotavirus, the leading cause of severe diarrheal disease in infants and children. The virus is spread by the fecal-oral route, which means that there are particles of feces that goes into the food and inedible.
Although children in developed countries rarely die from rotavirus infection, this disease is a killer in developing countries. WHO estimates that worldwide, 453,000 children under age 5 die from rotavirus infection in 2008.
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