“…Thirty-two studies reported the SARS-CoV-2 incidence or seroprevalence in sheltered homeless and their median sample size was 331 (QTR 51-11,463) ( 43 , 44 , 46–51 , 53 , 54 , 56–60 , 63 , 66–69 , 71 , 73 , 75 , 79 , 82 , 83 , 86–89 , 91 ) while 15 studies also simultaneously investigated SARS-CoV-2 incidence or seroprevalence among the shelter staff ( N = 5,000) ( 43 , 46 , 47 , 49 , 53 , 56 , 63 , 66 , 67 , 75 , 77 , 83 , 88 , 89 , 91 ) ( Supplementary Tables S1, S2 ). Four studies ( N = 1,351) ( 53 , 65 , 80 , 86 ) were conducted in the unsheltered homeless people while 15 ( N = 31,232) ( 44 , 52 , 55 , 61 , 62 , 70 , 72 , 74 , 76–78 , 81 , 84 , 85 , 90 ) in the mixed population comprising sheltered and unsheltered homeless subjects whose SARS-CoV-2 incidence or seroprevalence was not separately reported. For the diagnosis of active SARS-CoV-2 infection in homeless people, 40 studies were based on NAATs alone, 1 study was based on antigen tests alone, and 1 investigation was based on the combination of NAAT and antigen tests.…”