CD4 and hepatitis C virus infection: Hospital admission was associated with similar factors: regular or recent injecting 55, 56, 57, 69, 70, diagnosed hepatitis C 71, 72, diagnosed HIV 35, 56, 69, 70, 73, low CD4 count among HIV‐positive participants 74, female sex 38, 39, 49, 69, 70, 72, 74, homelessness or unstable housing 55, 69, alcohol use 72, polydrug use 47 and mental health problems 31, 37.