Not sure about the symptoms for STD. Search the website.
However, another point to note.
Bare blow job can also get AIDS. How and in what kind of situation?
1) When the girl has gum problem or ulcer - this usually has open wound (blood circulated out)
2) When the girl just finish her dental flossing her teeth - sure the gum will bleed.
However, studies said it is likely to be transmited from the man to woman, when the woman swallow the liquid from the man.
http://www.avert.org/howcan.htm
Quote from the website:
Oral sex
Oral sex with an infected partner does carry some risk of infection. If a person sucks on the penis of an infected man, for example, infected fluid could get into the mouth. The virus could then get into the blood if you have bleeding gums or tiny sores or ulcers somewhere in the mouth.
The same is true if infected sexual fluids from a woman get into the mouth of her partner.
But infection from oral sex alone seems to be very rare, and there are things you can do to protect yourself.
For more information