Distribution of HLA-B27 antigen in uveitis entities or associated disorders
| Uveitis entity or associated disorder | No of patients tested for HLA-B27/total No (%) | No of HLA-B27 positive in tested (%) |
| Idiopathic AAU (unilateral) | 74/74 (100) | 63 (85) |
| AS/SpA† | 10/10 (100) | 10 (100) |
| Unknown | 42/48 (88) | 4 (10) |
| Infection‡ | 18/30 (60) | 2 (11) |
| Other systemic disease§ | 8/14 (57) | 1 (13) |
| Specific ocular entity¶ | 34/44 (77) | 1 (3) |
| Total | 186/220 (85) | 81 (44) |
↵AAU= acute anterior uveitis. †Ankylosing spondylitis (AS) 2, undetermined spondyloarthropathy (SpA) 8 (7 unilateral acute anterior, 1 bilateral chronic anterior). ‡Toxoplasmosis 13, herpetic infections 8, Lyme borreliosis 7, cytomegalovirus infection 1, streptococcal infection 1. §Sarcoidosis 12, chronic lymphatic leukaemia 1, lupus erythematosus disseminatus 1. ¶Fuchs' heterochromic iridocyclitis 12, pars planitis 9, white dot syndrome 8, idiopathic retinal vasculitis 8, Posner Schlossman syndrome 2, ischaemic uveitis 2, birdshot retinochoroidopathy 2, infectious bilateral papillitis 1.