Yersinia pestis can become a weapon of bioterrorism and endanger human peace.
Therefore, the prevention and control of plague is more important.
Plague is a disease prevalent among wild rodents.
Rats and fleas, as important sources of infection, are introduced into human skin to cause bubonic plague, and then into respiratory tract to cause pneumonic plague.
The clinical manifestations are fever, severe toxic blood symptoms, lymphadenopathy, pneumonia and bleeding tendency.
All of them can develop into septicemia, with strong infectivity and high mortality. It is one of the most serious infectious diseases that harm human beings, and it is an international quarantine infectious disease. It is listed as the first class of infectious diseases by the Law on the Prevention and Control of Infectious Diseases in China.
History:
This disease was recorded as early as 2000 years ago.
In the history of the world, there were three pandemics of plague, and tens of millions of people died.
The first time it happened in the 6th century AD, it was introduced to Europe from the Mediterranean region, and nearly 654.38 billion people died. The second time occurred in14th century, and spread to Europe, Asia and Africa. The third time was in18th century, which affected 32 countries.
/kloc-The epidemic was introduced into China in the 4th century.
1793 "Dead Mice Walk" written by Shi Daonan, Yunnan Province describes that "dead mice in the east and dead mice in the west are like tigers to people.
The mouse died in a few days, and people died like a block. "
It fully shows that plague was very popular in China at that time.
Smallpox: 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.
Smallpox is caused by pox virus, and there is no cure. After the patient recovers, he will leave a pockmark on his face, hence the name "smallpox".
The appearance of smallpox virus is brick, about 200 nm× 300 nm. Strong resistance, can resist drying and low temperature, and can survive on crusts, dust and clothes for several months to one and a half years.
History: the extinction of Indians,
1. Prince Heshuo Jade-Aisin Qiao Luo Duo Duo Duo;
2. Dong Efei;
3. Emperor Tongzhi-Aisingiorro Zai Chun; Tongzhi Emperor Zai Chun is the only son of Xianfeng and Yehenara.
Born in Xianfeng for six years (1856).
Twelve years of tongzhi.
He died the following year. 19.
The name of the temple is Mu Zong.
He died of smallpox after two years in power.
4. the emperor shunzhi-Aisingiorro Fu Lin
All the above four people died of smallpox, and the only historical celebrity who survived smallpox was the Qing sage Kangxi-Aisingiorro Michelle Ye.
Europe
Queen Elizabeth I, 1562, almost died of smallpox.
Yellow fever: Yellow fever is the first acute viral infectious disease discovered by human beings and the first confirmed disease transmitted by mosquitoes.
Mainly distributed in South America and Africa.
Historically, it can be confirmed that the first epidemic of yellow fever occurred in Yucatan Peninsula in southeastern Mexico in 1648.
History:
1648 The first recorded yellow fever epidemic occurred in Yucatan Peninsula, Mexico.
This disease has existed in the Caribbean before.
From 17 to 19, the disease spread to North America and Europe through traffic and personnel flow, and became one of the most serious infectious diseases in parts of America, Africa and Europe, resulting in a large number of deaths and paralysis of some social activities.
For example, 174 1 year, 27,000 British troops attacked Colombia, and 20,000 people were infected with yellow fever and were defeated; 1762 British colonial troops invaded Cuba,18,000 of the 5,000 soldiers died of yellow fever; 1793 yellow fever epidemic in Philadelphia, USA, where 1/5 people died of yellow fever, resulting in complete social disintegration.
Later, the epidemic went deep into central North America along the Mississippi River, and at least 500,000 people were sick in the United States. 1800 An epidemic occurred in Spain, killing at least 60,000 people; 185 1 year, at least 23,000 people in Rio de Janeiro, Brazil die of this disease. In the first stage of Panama Canal excavation, the serious epidemic of this disease forced the project to stop. The disease occurred in 1826 when British colonists invaded Africa, and 535 colonial troops died within two months.115; Before 1940, yellow fever was also prevalent in Africa, causing a large number of deaths.
From 1793 to 1900, there are at least 500,000 patients in America. 1800, 60,000 people died in the Spanish epidemic; During the period of 185 1 ~ 1883, 23,000 people died of yellow fever in Rio de Janeiro, Brazil. From 1853 to 1900, 35,900 people died in Havana, Cuba; In 1905, 5000 cases occurred in New Orleans in central France, and 1000 people died.