What are some reasons why aids contagious?

HIV, the virus that causes AIDS, is not very contagious. It is mainly transmitted through unprotected sex, sharing needles or other drug paraphernalia, or accidental needle sticks.

Here are some reasons why AIDS is not as contagious as other diseases:

- HIV is a fragile virus. It is easily killed by heat, drying, and many common disinfectants. This means that it is not likely to survive outside the body for long periods of time.

- HIV can only infect certain types of cells. It can only infect cells that have a specific type of receptor on their surface. This receptor is found on some white blood cells, macrophages, and dendritic cells.

- The human immune system can fight off HIV. The immune system can produce antibodies that bind to HIV and prevent it from infecting cells. The immune system can also kill infected cells.

However, HIV can still be transmitted through contact with infected blood or other bodily fluids. It is important to practice safe sex and to avoid sharing needles or other drug paraphernalia to prevent the spread of HIV.