Seasonal immunity: Activity of thousands of genes differs from winter to summer -- ScienceDaily

Our immune systems vary with the seasons, according to a study that
could help explain why certain conditions such as heart disease and
rheumatoid arthritis are aggravated in winter whilst people tend to be
healthier in the summer. The study shows that the activity of almost a
quarter of our genes (5,136 out of 22,822 genes tested) differs
according to the time of year, with some more active in winter and
others more active in summer. This seasonality also affects our immune
cells and the composition of our blood and adipose tissue (fat).

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