Vehicles pass through the tolls at the Golden Gate Bridge in San Francisco, Calif., on Monday, February 24, 2014. Tolls may rise by $1 in April and another $1 over the next four years. Motorists heading to S.F. cross the Golden Gate Bridge, whose sign is reflected in a window.
It is hard to believe but HIV is actually a very fragile organism. If HIV is outside the body, its capsid disintegrates very quickly which instantly 'disarms' the virus. That is why infection is virtually impossible without direct blood-to-blood contact or through the mixing of body fluids containing the virus.his DNA then becomes part of the infected cell's genetic material. HIV is a 'slow' type of virus that falls into the category of lentiviruses. Lentiviruses are called slow viruses because they take a long time to cause damage to the body. See image 1.
There are two types of HIV; they are HIV-1 and HIV-2 and they have many subtypes. HIV-1 is the cause of the current worldwide pandemic while HIV-2 is found in west Africa but rarely elsewhere. HIV-2, which is transmitted in the same ways as HIV-1, causes AIDS much more slowly than HIV-1. HIV-1 resulted from human infection by SIVcpz that infects chimpanzees and HIV-2 resulted from infection by SIVsmm harbored by sooty mangabeys. HIV-2 is closely related to the SIV found in west Africa.