Q: I have read that the infection probability from an HIV positive woman to a man is less than 1:200 even during unprotected sex. Is this correct, what source of date do we have in order to support this? What is the ratio incase of man to woman?

A:One does not acquire infection by statistics - the rate of transmission of infection from a HIV + woman to man is dependent on so many factors and it is anything from 0.1% to 1% that is 1:1000 to 1:100. But remember you could be the that one. The rate of transmission from HIV+ man to woman is higher than vice-versa.