not strictly "new" but more easily spread, and exploding in prevalence https://www.ncbi.nlm.nih.gov/books/NBK83714/ > Seropositivity is more prevalent in sexual risk groups such as female commercial sex workers (CSW) (Khabbaz et al., 1990) and promiscuous men engaged in homosexual activities (Bartholomew et al., 1987). In such cases, the seropositivity rate is associated with the number of sexual partners, time in prostitution activities, and presence of other STDs.