PMID- 19153174 OWN - NLM STAT- MEDLINE DCOM- 20090710 LR - 20220321 IS - 1352-4585 (Print) IS - 1352-4585 (Linking) VI - 15 IP - 4 DP - 2009 Apr TI - Effects of infectious mononucleosis and HLA-DRB1*15 in multiple sclerosis. PG - 431-6 LID - 10.1177/1352458508100037 [doi] AB - BACKGROUND: Both human leukocyte antigen (HLA)-DRB1*15 and Epstein-Barr virus infection presenting as infectious mononucleosis (IM) are recognized as risk factors for multiple sclerosis (MS). However, their combined effect and possible interaction on MS risk is not known. OBJECTIVE: To assess the association between HLA-DRB1*15 and risk of MS in persons with and without IM. METHODS: We compared the prevalence of DRB1*15 in MS patients with (n = 76) and without (n = 1,836) IM with the corresponding distributions in blood donors with (n = 62) and without (n = 484) IM histories. This allowed us to estimate the relative risk of MS associated with DRB1*15 in the presence and absence, respectively, of previous IM. We then estimated the interaction between DRB1*15 and IM as the ratio of the two individual odds ratios. RESULTS: In IM-naive individuals, DRB1*15 carried a 2.4-fold (95% confidence interval [CI], 2.0-3.0) increased MS risk. In contrast, among persons with IM history, DRB1*15 was associated with a 7.0-fold (95% CI, 3.3-15.4) increased MS risk. Thus, the MS risk conferred by HLA-DRB1*15 was 2.9 (95% CI, 1.3-6.5)-fold stronger in the presence than in the absence of IM. Combined with previous results, this result indicates that DRB1*15-positive persons with a history of IM may be at a 10.0-fold (95% CI, 6.0-17.9) increased risk of MS compared with persons who are DRB1*15 and IM-naive. CONCLUSION: DRB1*15 and IM may act in synergy causing MS. FAU - Nielsen, T R AU - Nielsen TR AD - Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark. trn@ssi.dk FAU - Rostgaard, K AU - Rostgaard K FAU - Askling, J AU - Askling J FAU - Steffensen, R AU - Steffensen R FAU - Oturai, A AU - Oturai A FAU - Jersild, C AU - Jersild C FAU - Koch-Henriksen, N AU - Koch-Henriksen N FAU - Sorensen, P S AU - Sorensen PS FAU - Hjalgrim, H AU - Hjalgrim H LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20090119 PL - England TA - Mult Scler JT - Multiple sclerosis (Houndmills, Basingstoke, England) JID - 9509185 RN - 0 (HLA-DR Antigens) RN - 0 (HLA-DRB1 Chains) RN - 0 (HLA-DRB1*15 antigen) SB - IM CIN - Mult Scler. 2010 Jan;16(1):127-8. PMID: 20051521 MH - Genetic Predisposition to Disease/epidemiology MH - HLA-DR Antigens/*genetics MH - HLA-DRB1 Chains MH - Humans MH - Infectious Mononucleosis/*epidemiology/*genetics MH - *Multiple Sclerosis/epidemiology/genetics/virology MH - Prevalence MH - Risk Factors EDAT- 2009/01/21 09:00 MHDA- 2009/07/11 09:00 CRDT- 2009/01/21 09:00 PHST- 2009/01/21 09:00 [entrez] PHST- 2009/01/21 09:00 [pubmed] PHST- 2009/07/11 09:00 [medline] AID - 1352458508100037 [pii] AID - 10.1177/1352458508100037 [doi] PST - ppublish SO - Mult Scler. 2009 Apr;15(4):431-6. doi: 10.1177/1352458508100037. Epub 2009 Jan 19.