Introductory Editorial: the analysis of a natural experiment in HIV control

sexual practices and condom use * the age distribution of those living with HIV infection * the rates of sexually transmissible infections (STI) between states * the testing rates for HIV and hence differential detection of HIV * the access and provision of health care services to MSM * the uptake of HIV treatment among MSM * the use of primary HIV infection * the use of suppressive herpes medication * disclosure of HIV status and hence sero-sorting * expenditure and investment in HIV prevention