The predicted decrease in the average time from HIV infection to diagnosis is supported by results from the Swiss Gay Survey 2009, which shows that the estimated proportion of MSM who had had an HIV test within the last 12 months increased from 30% in 2007 to 40% in 2009 [6], and the SHCS in which the median CD4 cell count at diagnosis in MSM has increased from 387 cells/mm3 (inter-quartile range, 160–521) in 2000 to 441 cells/mm3 (286–598) in 2009. Here, CD4 is linked to HIV infectious disease.