Straw question

If someone lets just say had bleeding gums and has the virus, and chewed on a straw that I was going to use, what are the chances of infection if I chose to use the straw to drink. If No or Low risk, can someone tell me why? I believe that the virus can't live long outside the body, but lets just say the person chewed the straw around 1 minute and I use it after.

[fattu11]

http://www.medhelp.org/forums/HIV/messages/286.html

[unnoticed16]

"you could swallow a tablespoon of infected blood with only a small chance of transmission."

So if that person had bleeding gums, hypothetically speaking it can't go anywhere as far as 1 tablespoon, and having it out in the environment already kills some of the virus. So the risks are close to 0?