The first time I ask about HIV, please help me

[zhanghao]

  I am a college student from China, last week the school with intramuscular vaccine. Because I am afraid of injections, afterwards, i called a classmate to help me press the pinprick of the needle with  cotton hemostasis. Then the cotton swab down, his  finger press  directly on my wound of the needle . and  his fingers above just have a bleeding wound. His blood pressure in the hole of  the needle above me directly. I was very afraid, because I know the students often outside prostitution.
  my question is If  my classmate is hiv+ ,he press his finger aginst at the place of needle prick immediately ,Is this a way of transmission hiv ?
If not , please tell me why,thank you doctor
  

[zhanghao]

thanks your answer,but if the blood directly from my classmate's finger, straight into my poke hole from the needle , do not have contact with air?
Because of his finger is bleeding,the blood press to my pinprick , will directly enter not contact with air.

[RainLover71]

No risk because HIV becomes inactive once exposed to air and therefore unable to infect you.

[zhanghao]

thanks teak,Many people in China know you, you are a AIDS fighter.Can you tell me the reason why is no risk? Because the pinprick is too small wound?

[Teak]

Not an HIV concern.