Top ten viruses

Ebola virus 1976 has appeared in Central Africa, and it is not known where it came from. Ebola virus can crush human internal organs, and every pore of infected people will ooze blood. Up to 90% of infected people die.

2. Smallpox virus

Smallpox is a serious infectious disease caused by smallpox virus, and it is also the first infectious disease that has been eliminated by human beings in the world so far. The average incubation period after smallpox virus infection is about 12 days (7- 17 days).

3. AIDS

AIDS is a very harmful infectious disease, which is caused by HIV infection. HIV is a virus that can attack the human immune system. It takes the most important T lymphocytes in the human immune system as its main target, destroys it in large quantities, and makes the human body lose its immune function. Therefore, the human body is susceptible to various diseases, malignant tumors can occur, and the mortality rate is very high.

4. Polio

Also known as polio, it has caused more than 19 10000 deaths since 2006. Polio is a serious viral infection, which is transmitted through the mouth or anus.

5. Lassa fever virus

Lassa fever is caused by sand virus, which was first discovered by doctors in 1950s. Once infected with this virus, people's internal organs will bleed a lot, their blood pressure will drop sharply and their brains will be damaged. 1 person died in every 7 infected people.

6. Dengue virus

This is an endemic disease in the tropics. Spread by mosquito bites, there will be a lot of internal bleeding. Up to 50% of infected people die.

Dengue virus is a small flavivirus, which belongs to yellow fever virus and can cause acute infectious diseases such as dengue fever. It is usually spread by Aedes aegypti and Aedes albopictus, which bite people during the day.

7. Machupo

A sandvirus, 1962, was first discovered in Bolivia and was carried by mice. At the initial stage of infection, it showed fever, and then nose and gums began to bleed, and gastrointestinal bleeding, and 30% of infected people died.

8. Influenza

19 18. At the end of World War I, 37 million people died in the war and millions of soldiers began to return home. At this time, a new disease appeared, some people called it Spanish flu, or century flu and 19 18 flu. The disaster claimed 20 million lives in a few months. Within a year, the flu continued to spread and the death toll was very alarming.

9. Black Death

Some scientists think that the Black Death may be a hemorrhagic virus similar to Ebola virus. Scientists are studying the remains of suspected plague victims, hoping to find some genetic evidence to confirm this theory.

10, malaria

The earliest record of malaria appeared 4000 years ago, when the Greeks described the destructive effects of malaria. The earliest statement about mosquito-borne diseases appeared in medical books in ancient India and China. Even now, scientists have found that many diseases are related to mosquitoes. Malaria is generally caused by mosquitoes and protozoan microorganisms on human body. When infected mosquitoes stay on human skin and start sucking blood, plasmodium microorganisms will enter the human body.