A recent study has shown that, among newly diagnosed asylum seekers in a primary HIV referral centre in Montréal between 2017 and 2018, the median time from entry into Canada to HIV testing was estimated at 27 days, almost two-thirds of patients were late presenters (CD4 <350 cells/μL), almost a quarter presented with an advanced stage of HIV infection (CD4 <200 cells/μL), and only 45% of patients were linked to care within 30 days [19, 20]. This evidence concerns the gene CD4 and HIV infectious disease.