I would bet my life that it is statistically irrelevant, to contract AIDS through anything but blood to blood contact. It may not even be virus caused, the studies simply have not been done. Nobody has injected HIV into healthy humans to see if they develop AIDS? It is unproven, and deaths from AIDS are virtually unheard of in this country, as opposed to when they killed people with AZT. I remember when doctors, dentists and nurses were afraid of working on patients with AIDS. It turns out that Hepatitis in its various forms is much more dangerous and deadly.
HIV-infected mothers are strongly discouraged from breast-feeding their infants, because of the transmission risk.