In the course of human civilization, there are always new viruses constantly appearing. Some viruses that are highly toxic, mutate quickly, and have a wide range of transmission routes tend to have catastrophic consequences for humans. Let’s review the ten most dangerous viruses in human history together and awaken those sad memories that year.
Ebola virus-currently the most dangerous
Ebola is a very rare virus. After its presence in southern Sudan and the Ebola region of the Democratic Republic of the Congo (formerly known as Zaire) in 1976, it attracted widespread attention and attention from the medical community. “Bola” got its name. Is a generic term used to refer to a group of viruses belonging to the family Fibrovirus Ebola virus. It is a severe infectious disease virus that can cause Ebola hemorrhagic fever in humans and primates. It has a high mortality rate between 50% and 90%. The main causes of death are stroke, myocardial infarction, and low blood pressure. Volume shock or multiple organ failure. In July 2014, the Ebola virus broke out again in Africa, with more infections and deaths than ever before, and it continues to spread without any sign of control.
Influenza A virus-“most dangerous member” of the influenza virus family
There are three types of influenza viruses, namely type A, type B and type C. Among them, influenza A virus is the one we are more familiar with and the most dangerous one. The most shocking flu in history occurred in 1918. This global flu claimed 50 million lives. The culprit was the influenza A virus named H1N1. The avian flu that has changed color is also a type of influenza A. In recent years, H5N1 and H7N9 have been prevalent. The terrible thing about influenza A is that it can evolve new disease strains through short-term genetic recombination. Each recombination has increased toxicity, increased infectivity, and can cause the original treatment to fail. The symptoms of patients after infection are mainly high fever, cough, runny nose, myalgia, etc. Most of them are accompanied by severe pneumonia. In severe cases, heart and kidney failure cause death, and the mortality rate is very high.
HIV-attack on immune cells, malignant tumors “visited”
The virus can cause AIDS. The virus targets the most important T lymphocytes in the human immune system as the main target of attack, destroying a large number of these cells, causing the human body to lose its immune function. Therefore, the human body is susceptible to various diseases, malignant tumors can occur, and the mortality is high. The incubation period of the virus in the human body is 8-9 years on average. Patients can live and work for many years without any symptoms before the symptoms of AIDS occur. There are currently no drugs that can cure AIDS, and some drugs that have been developed can only alleviate the symptoms of AIDS patients and prolong their lives to a certain extent.
Smallpox virus-rest assured, it has been eliminated!
The virus can cause the small infectious disease smallpox, which is by far the only infectious disease that has been eliminated worldwide by humans. Patients infected with variola virus will have asparagus on their face after recovery, hence the name “smallpox”. Smallpox incidence of human history is the highest , most of those who died of infectious diseases. In the 16th to 18th centuries, the number of smallpox deaths in Europe was about 500,000 in Asia and about 800,000 in Asia. In the 18th century, the total number of smallpox deaths in Europe was over 150 million. From the 19th century to the beginning of the 20th century, smallpox was still rampant; this continued until the second half of the 20th century.
Rabies virus-100% mortality after onset!
The virus can cause rabies, which is a serious acute infectious disease that is mainly transmitted from humans to humans through rabies virus. It can cause acute encephalitis and peripheral nerve inflammation in animals, with mortality rates as high as 100%. Infectors who have not been immunized with vaccines have almost all died after the onset of neurological symptoms. The usual cause of death is due to the destruction of the central nervous system (brain-spinal cord) by the virus, and they eventually die of organ failure and breathing caused by damage to the autonomic nervous system Exhaustion. The source of infection was mainly dogs, followed by cats and wolves. Rabies can be prevented by vaccination. If accidentally bitten or scratched by animals such as dogs, cats, wolves, or damaged skin or mucous membranes, animals must be vaccinated.
Hepatitis virus-there are “five brothers” at home, all are “ruthless roles”
The virus can cause hepatitis. Hepatitis is often divided into five types: A, B, C, D, and E. They are all infectious diseases. Patients may experience symptoms such as loss of appetite, nausea, upper abdominal discomfort, pain in the liver area, and fatigue. Liver cancer caused the patient to die. Hepatitis B is the most common infectious disease in the world alongside tuberculosis and AIDS. About 350 to 400 million people worldwide are infected with the hepatitis B virus. Different hepatitis transmission routes are different. Hepatitis B and D are mainly transmitted through contact with the blood and other body fluids of infected people. Hepatitis C is mainly transmitted through blood. Hepatitis A and E are transmitted through diet.
Dengue virus-“buzz” to spread, children easily hit
The virus is transmitted through mosquito bites and can cause an acute infectious disease, dengue fever. The disease first occurred in tropical regions, mostly during the rainy season, and this environment easily breeds a large number of mosquitoes that carry the virus. The scale of outbreaks of infectious diseases is getting larger and larger, and the proportion of dengue hemorrhagic fever is getting larger and larger. 50 to 100 million cases of dengue fever occur every year worldwide, and 2.45 billion people are threatened by the infection. Dengue affects people of all ages, but the majority of dengue fever occurs in children under 15 years of age.
SARS coronavirus-the Chinese people are most familiar
The virus can cause severe acute respiratory syndrome, known as SARS. According to information published by the World Health Organization, the average mortality rate of SARS patients is about 9.6%, and the highest may reach 14% to 15%. The disease first appeared in Shunde, Guangdong, China in 2002, and spread to Southeast Asia and the world. The epidemic was gradually eliminated in mid-2003. The disease is an infectious disease of the respiratory tract, and the main transmission mode is close droplet transmission or contact with respiratory secretions of patients.
Marburg virus-currently unruly
The virus was first discovered in Marburg, Germany in 1967. The infectious disease called Marburg hemorrhagic fever can be transmitted through body fluids (blood, feces, saliva, vomit, etc.). The patient’s symptoms were high fever, diarrhea, vomiting, and severe bleeding in various holes in the body. Usually died a week after the onset of illness. Onset mortality is 25% to 100%. There is currently no vaccine or cure for this highly infectious and deadly disease.
West Nile virus-again a mosquito
West Nile virus is a tropical and temperate virus that can cause the infectious disease West Nile Fever. It mainly infects birds, but also humans, horses, cats, skunks, squirrels, and rabbits. The source of human infection with the virus is mosquitoes, which can be prevented by mosquito killing. The virus is relatively mild, and about 80% of humans have no obvious symptoms after infection. About 20% of people have only mild flu-like symptoms, and only 0.7% of patients die because the virus enters the brain and causes encephalitis.
Although the virus is terrible, a strong body is the best weapon to protect the body from the virus. After work, strengthen physical exercise.