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Influenzas – both seasonal and pandemic – increase in the winter (low vitamin D) – Dec 2010

The seasonality of pandemic and non-pandemic influenzas: the roles of solar radiation and vitamin D.

Int J Infect Dis. 2010 Dec;14(12):e1099-105. doi: 10.1016/j.ijid.2010.09.002. Epub 2010 Oct 29.
Juzeniene A asta.juzeniene at rr-research.no, Ma LW, Kwitniewski M, Polev GA, Lagunova Z, Dahlback A, Moan J.

Russian Flu

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Spanish Flu

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All Flu

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OBJECTIVES:
Seasonal variations in ultraviolet B (UVB) radiation cause seasonal variations in vitamin D status. This may influence immune responses and play a role in the seasonality of influenza.
METHODS:
Pandemic and non-pandemic influenzas in Sweden, Norway, the USA, Singapore, and Japan were studied. Weekly/monthly influenza incidence and death rates were evaluated in view of monthly UVB fluences.
RESULTS:
Non-pandemic influenzas mostly occur in the winter season in temperate regions. UVB calculations show that at high latitudes very little, if any, vitamin D is produced in the skin during the winter. Even at 26°N (Okinawa) there is about four times more UVB during the summer than during the winter. In tropical regions there are two minor peaks in vitamin D photosynthesis, and practically no seasonality of influenza. Pandemics may start with a wave in an arbitrary season, while secondary waves often occur the following winter. Thus, it appears that a low vitamin D status may play a significant role in most influenzas.
CONCLUSIONS:
In temperate latitudes even pandemic influenzas often show a clear seasonality. The data support the hypothesis that high fluences of UVB radiation (vitamin D level), as occur in the summer, act in a protective manner with respect to influenza.

Copyright © 2010 International Society for Infectious Diseases. Published by Elsevier Ltd. All rights reserved.

PMID: 21036090


 Download the PDF from VitaminDWiki.

Observation by VitaminDWiki

  • 2014 Ebola became worse during the Liberia rainy season (summer) = less vitamin D.
  • Middle East has the worst influenza during summers – it is so hot that people avoid being outdoors in the middle of the day – even for a few minutes

See also VitaminDWiki

Attached files

ID Name Comment Uploaded Size Downloads
4511 Influenzas all.jpg admin 23 Oct, 2014 16:37 102.42 Kb 723
4510 Spanish Flu.jpg admin 23 Oct, 2014 16:37 53.28 Kb 599
4509 Russian Flu.jpg admin 23 Oct, 2014 16:37 47.68 Kb 614
4508 influenzas 2010.pdf PDF admin 23 Oct, 2014 16:14 244.68 Kb 429
4507 10.1016-j.ijid.2010.09.002Figure.ppt admin 23 Oct, 2014 16:12 157.00 Kb 549
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