Prasertvit P, et al. – The bi–fold aim of this paper involved the assessment of the utility and safety of Nevirapine (NVP) patch testing in Thai HIV patients with NVP hypersensitivity and the analysis of the link between positive patch tests with HLA–B*3505. The patch testing was safe and could be used to ascertain the correlation between NVP and hypersensitivity skin reactions. NVP patch test results displayed a marked association with HLA–B*3505. The sensitivity of HLA–B*3505 for positive patch test was found to be 100%.