The mean CD4 counts at the time of TB diagnosis for the different subgroups presented in Table 1 were the following: males 196 cells per cubic millimetre (range 5–854), females 241 (9–859), IDU 183 (5–634), MSM 303 (10–854), heterosex 194 (9–859), place of birth Finland 221 (5–854), place of birth Sub-Saharan Africa 220 (19–541), place of birth other 146 (9–561). This evidence concerns the gene CD4 and tuberculosis.