Disinfection cap (3000) includes housing (3002) comprising closed top (3022), essentially cylindrical sidewall (3004), and open bottom (3024) formed by the sidewall with opening (3026) to inner cavity (3028) within the housing for receiving mating feature (133) of needleless connector (93). Disinfection sponge (3080) can be configured within inner cavity, with removable cover (1599) sealing opening to inner cavity to seal sponge within inner cavity prior to cap use. Inner cavity includes threads (3040, 3042) on inner surface (3030) of its sidewall that do not correspond to the mating feature (133) of needleless connector. One thread (3040) engages with mating feature (133) of needleless connector. Plurality of disinfection caps can be disposed on strip (2220) of IV pole hanging device (2260) such that each cap can be peeled off the strip unsealed for immediate use, or separated from the strip sealed for later use.