Can i get aids from sharing asame whistle with an hiv infected person?

No: This kind of casual sharing hasn't been shown to spread the disease epidemiologically. The virus is wimpy. Drying kills the virus, saliva interferes with transmission, the load of virus and the availability of infected cells is low, and there's little possibility of anything entering your bloodstream. Life's scary enough without manufactured fears like this one.

No: There is no risk of transmission of HIV to you from blowing your friends whistle. Even if your friend had a minute amount of blood on the whistle from some serious blowing, HIV is a very fragile virus and would not survive in the environment to even have the possibility of being infective. Rest assured. Take care.

Highly unlikely: The incidence of HIV transmission from this 'sharing' would be incredibly small. When the HIV virus is exposed to air it dies. So the time between shared uses is important here.

No: However if you see active blood on the whistle you should wash with soap and water before using. Exposure to body fluids should be minimized even in the absence of HIV except for intimacy.