No, she doesn't. She took antibiotics and basically prepped her immune system beforehand. By the third game, if she survives the suicide mission to the Collector Base, she'll be able to sleep with Shepard without the use of antibiotics because she's built an immunity to him.
Nope!!.
no but she could die from suicide if your not careful.
No.
I slept with tali in the 2nd mass effect and now im not sure if she will die cuz I did sleep with her I don't get a straight forward yes or no anywhere so if anyone know if she does?