Ebola, rabies, smallpox, hepatitis B What do you know about these deadly viruses that make people smell and smell? Let's take a look at the top ten deadliest viruses in history. What symptoms do they have and how do they spread?
Symptoms: nausea, vomiting, diarrhea, skin color change, general pain, internal bleeding, external bleeding, fever, etc.
Route of transmission: through the patient's body fluids, such as blood, sweat, vomit, excrement, urine, saliva or semen, there is no evidence of droplet infection.
Ebola is listed as the fourth grade virus of biological hazards and is regarded as one of the tools of bioterrorism. The electric death rate of Ebola in North IL is as high as 41096-90%.
(a)Dengue fever virus（Dengue Fever）
Symptoms: fever, headache, muscle and joint pain, and typical measles like rash.
Route of transmission: bite of infected Aedes aegypti.
Half of the world's population is at risk of contracting dengue, with 50 to 528 million people infected each year and about 20000 dying as a result.
(a)yellow fever(Yellow Fever)
Symptoms: fever, chills, loss of appetite, nausea, muscle pain (especially in the back) and headache.
Route of transmission: bite by specific Aedes and Haemophilus.
Yellow fever infects about 200000 people a year and causes 30000 deaths (nearly 90% in Africa).
Symptoms: anxiety, confusion, auditory hallucination, insomnia, dysphagia, leg paralysis.
Route of transmission: bites from infected animals, usually dogs or bats.
If not treated before symptoms appear, the mortality rate is almost 100%. Rabies causes 26000-55000 deaths worldwide every year, more than 95% of which occur in Asia and Africa, and 97% of the deaths are caused by dogs.
Children around the age of five have been infected with rotavirus at least once, with symptoms including vomiting, diarrhea, severe dehydration and high fever.
Route of transmission: fecal oral transmission (ingestion of food infected by feces).
The treatment of rotavirus is not complicated, but more than 450000 infants under five years old still die of rotavirus infection every year.
Symptoms: high fever, runny nose, sore throat, muscle soreness, headache, cough and tiredness.
Route of transmission: the virus is usually transmitted by droplets produced by coughing, sneezing and speaking.
Each year during the flu season, there are about 3 to 5 million serious cases, of which about 250000 to 500000 die.
(a)hepatitis B(Hepatitis B)
Symptoms: most people have no obvious symptoms at the time of initial infection, while a few people have acute symptoms, such as nausea and vomiting, jaundice, fatigue, brown urine and abdominal pain.
Route of transmission: contact with infected blood or body fluids, especially blood infection.
One in three people in the world has ever been infected with hepatitis B virus, and about 240 million to 350 million of them will turn into chronic hepatitis. It is estimated that about 750000 people die of hepatitis B every year.
Symptoms: high fever, head to toe rash, various complications, such as brain swelling, blindness, severe respiratory infection.
Route of transmission: coughing, sneezing or other intimate contact. It can also be transmitted through saliva or nasal secretions.
Measles affects about 20 million people every year, mainly in Africa and Asia. It causes the highest number of deaths among vaccine preventable diseases. Before the widespread use of measles vaccine in 1980, it was estimated that about 2.6 million people died of measles every year.
Ancient Egypt may be the origin of smallpox, and Ramesses V, the Pharaoh who has been dead for more than 3000 years, may be the first smallpox patient in history.
In the long history, smallpox has been popular in many parts of the world, taking countless human lives (especially children).
In the 20th century alone, about 500 million people died of smallpox. In 1980, the World Health Organization officially announced the eradication of smallpox, making it the first extinct human infectious disease.
(a)human immunodeficiency virus(HIV)
Symptoms: opportunistic infections usually occur, such as Kaposi's sarcoma and Pneumocystis pneumonia. In addition, symptoms such as sudden weight loss, persistent fever and lymphadenopathy will occur. The virus will invade human immune cells and destroy them.
Route of transmission: unprotected relationship with the infected person, lactation, drug injection, unsafe blood transfusion.
In 2016, the World Health Organization estimated that there were 36.7 million people living with HIV around the world. Since it was found in 1981, about 36 million people have died of AIDS.