What is the origin of AIDS?

Studies show that AIDS originated in Africa and was brought to the United States by immigrants. On June 5th, 198 1, the US Centers for Disease Control and Prevention published five cases of AIDS in Morbidity and Mortality Weekly, which is the first official record of AIDS in the world. In 1982, this disease is named "AIDS".

Soon after, AIDS quickly spread to all continents. 1985, a foreigner who traveled to China fell ill and died soon after being admitted to Peking Union Medical College Hospital, and was later confirmed to have died of AIDS. This is the first case of AIDS in China.

It takes several years for HIV-infected people to develop into AIDS patients, even as long as 10 years or longer. Due to the extreme decline of the body's resistance, there will be many infections and serious infections caused by many pathogens. In the later stage, malignant tumors often occur, and long-term consumption leads to systemic failure and death.

Structure of HIV:

The diameter of human immunodeficiency virus is about 120 nm, which is roughly spherical. The virus outer membrane is lipid envelope, which comes from the host cell and contains virus proteins gp 120 and GP 4 1. Gp4 1 is a transmembrane protein, and gp 120 is located on the surface, and binds to gp4 1 through non-* valence interaction.

There is a spherical matrix formed by p 17 protein and a semicircular conical capsid formed by p24 protein. Under the electron microscope, the shell has a high electron density. The capsid contains the viral RNA genome, enzymes (reverse transcriptase, integrase, protease) and other components from the host cell.

Refer to the above? Baidu encyclopedia-AIDS