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The article focuses on the research which shows the association between infectious mononucleosis (IM) and multiple sclerosis (MS) in Norway. The research was conducted on 1660 MS patients and 3050 control groups from Norway and Italy .It states that IM occurs frequently in Norway but was linked with MS to a similar degree in the country. It mentions that IM is linked with MS independently of season, while its association with IM during spring is not stronger.

The article discusses study which aims to determine if the risk of multiple sclerosis (MS) is linked with month of birth in Norway and to explore latitudinal gradient. The study employs latitudinal analysis, Poisson distribution, and IBM SPSS statistics 20. Results confirm the previous study on the increased MS births in spring and a decrease in winter. It adds that the results support role of decreased sunlight exposure in time of pregnancy and vitamin D deficiency in prenatal life in MS.

Abstract: Multiple sclerosis (MS) risk is determined by environmental influences acting on the individual genetic background. Recent epidemiologic and experimental evidence supports a role of low environmental supplies of vitamin D in mediating an increased susceptibility to MS. We review available evidence suggesting that vitamin D status may influence MS risk and even modulate clinical disease activity. The level of serum 25-hydroxyvitamin D providing these effects remains to be determined. [Copyright &y& Elsevier]