Of all existing on the planet of organisms the largest area coverage and the number are pathogens, including bacteria, sticks and, of course, invisible to the human eye the viruses. The latter are the causative agents of diseases that vary in symptoms, nature of occurrence and severity.
To identify the most dangerous virus to humans is difficult, as the need to apply different approaches to analysis. For example, there are pathogens that alter the General mortality rate of the population. Others lead to death of those already infected. Third kill the host faster than it has time to distribute them to other people. For example, if the mortality rate to 3% the Ebola virus and the Spanish flu pandemic claimed the life of more than 100 million people. And there's historical approach to assessing the harmfulness of the virus. It demonstrates how the micro-organism has killed more people throughout human history.
We offer you a list of the 10 most dangerous viruses on the planet, which annually cause hundreds of thousands of human lives. We will add some statistics and numbers and data about the characteristic symptoms for viral diseases of one type or another.
10. Arboviruses of the Flaviviridae family
These dangerous pathogens cause specific disease, Dengue fever. The patient was worried about an acute pain in musculoskeletal system (the joints, especially the knee, spine). Also, the patient notes a hyperthermia, fever and a fever, nausea and vomiting. There is often itchy rash on the body. It is known that if the disease becomes severe, in half of the cases fatal. Pick arbovirus through an insect bite (tick, mosquito, etc.). Before traveling to a zone of distribution of the virus take care of preventive vaccination and other methods of personal protection.
9. The flu virus
In the modern world, "common cold" does not cause people to panic as it is easily treatable. Simply put, the immunity of the person is resistant to many strains of infectious lesions of the respiratory tract. Only few people know that there are more than 2 million variants of the virus, which are classified according to serotypes (b, A, C) and strains. Serotype A is life-threatening, as it causes massive epidemics and even pandemics. Each year from seasonal outbreaks of influenza deaths to half a million people (most often children and the elderly). A virulent strain of the virus was so-called "Spanish flu," which in 1918 was struck by about a third of the world's population, taking away of the lives of about 100 million patients. The greatest risk was exposed to people with a strong immune system, which ultimately provoked the so-called "cytokine storm".
8. Hepatitis C virus (HCV)
Specific disease may be masked by symptoms of other disease, so a person can for a long time not to suspect the presence in the body of the virus. So gradually, the disease becomes chronic, which causes liver failure and, as often happens, death. The virus takes annually about 350 thousand patients and in developing countries. Inexorable statistics says that there are 200 million speakers of this dangerous microorganism. Unfortunately, the disease is not responding to therapy, but an effective vaccine has not been developed. Hepatitis C infection occurs through blood, and is often the source of medical and cosmetic instruments, unprotected sexual acts, poor hygiene.
7. The hepatitis b virus (HBV)
The hepatitis b virus leaves the patient a chance of recovery, but in 20-30% of cases still progressing chronic, causing cirrhosis or cancer of the liver. In the year of the "Reaper" carries about 700 thousand human lives. As well as the previous type of hepatitis, it provokes an asymptomatic disease that slowly attacks the liver years. The disease most often diagnosed in children. The virus may not suffer the consequences, but actively share it with others. The virus is characterized by resistance to temperature fluctuations. Is transmitted through a drop of blood by household, as well as through injection, tools, sharp instruments, sexual relations.
6. The rabies virus
Occurs in warm-blooded animals and is transmitted from them to man. Causes rapid and irreversible damage to the Central nervous system. The virus is transmitted through the saliva of an infected animal during a bite. The temperature rises to subfebrile figures, the patient complained of sleep disorders, notes the outbursts of aggression, hallucinations, paranoid delusions. Then observed paralysis of the limbs and the eye muscles, the respiratory system, leading to death. Unfortunately, symptoms of the disease appear already at the stage when the virus enters the brain and causes degradation of nerve cells. To save the life of the vaccine can only be taken as soon as possible after being bitten by a stray animal.
Is a group of viruses that is transmitted by the fecal-oral route. Causes bouts of acute diarrhea, dehydration and occurs mainly in young children. Despite available therapies, the disease takes away every year about 450 thousand preschoolers (mostly residents of underdeveloped countries). Rotavirus is a disease of "dirty hands", so the best prevention is personal hygiene, especially after visiting public places.
4. The Ebola Virus
The organism causes hemorrhagic fever. Transmitted through bodily fluids, infected tissues and blood. Accompanied by a sharp rise in temperature, aching muscles, lethargy, muscle spasms, migraine and pain in the throat. There may also be nausea and vomiting, indigestion, skin rashes, kidney and liver. Severe marked external and internal bleeding. The mortality rate from Ebola in 2015 amounted to 42% of patients.
3. The variola virus
Survivors seen from afar – the skin is dotted with numerous scars. The first symptoms of "smallpox" is a high temperature and a rash on the body (pus blisters). When complications are noted headaches, spasms, vertigo, pain in the Sacro-lumbar, nausea and vomiting. In the 20th century, the epidemic took about 300-500 million. The last case was registered in 1977. Climate change in recent years can lead to a return of the disease. By the way, the smallpox virus infects only humans.
2. Virus of the family Flaviviridae
Carry the pathogen for the mosquitoes living in areas of South America and on the African continent. Once in the body, the virus causes "yellow fever" which is accompanied by jaundice. Since the 80-ies of the spread of the disease increases, which is caused by the deterioration of the immune system in humans, climate change. In severe form of the disease, the liver can not cope with the function and there comes a lethal outcome. Tourists visiting the above countries, it is recommended to vaccinate.
1. The human immunodeficiency virus
Is considered the most dangerous virus that is transmitted through bodily fluids and blood. The most common causes of HIV are unsterilized medical and cosmetic devices, drugs (recycling), promiscuity. Average life expectancy for infection without adequate treatment is 9-11 years.
These are the dangerous microorganisms are always around us and threaten life. For the prevention of infection, timely vaccination pass, follow the rules of personal hygiene, use of barrier methods of protection and avoid contact with infected people.