Tripledemic: Flu, COVID, and RSV (all fought by Vitamin D)
A ‘Tripledemic’? Flu and Other Infections Return as Covid Cases Rise - New York Times
"R.S.V. causes about 14,000 deaths among adults 65 and older and up to 300 deaths among children under 5 each year."
"Flu season in the southern hemisphere, typically between May and October, is highly predictive of winters in the northern hemisphere. This year, flu began weeks earlier than usual in Australia and New Zealand, and the number of cases and hospitalizations were markedly higher."

:Dr. Gordon tracks influenza rates among children in Nicaragua, which has one flu season in June and July, and a larger one in the late fall. "
Note: the Middle east also has Flu season in the summer - they avoid the hot sun so much that they have little vitamin D in the summer
Pigs used to get the flu only in the winter ( had got Vitamin D in the summer) - Nov 2018
All three viral infections can result in viral pneumonia

Pneumonia elderly death 12X more likely when vitamin D less than 12 ng – 2011
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- One of the co-authors is the founder of VitaminDWiki
Fewer children died of pneumonia after 100,000 IU Vitamin D injection – RCT March 2021
VitaminDWiki - Overview Influenza and vitamin D contains
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Also
Influenza infection 5X less likely if got vitamin D – small RCT Feb 2022
Influenza prevented by 40 ng levels or treated with vitamin D hammer (50,000 IU) – June 2015
7X less risk of influenza if Vitamin D levels higher than 30 ng – Oct 2017
[Influenza infection 5X less likely if got vitamin D – small RCT Feb 2022]
VitaminDWiki – COVID-19 treated by Vitamin D - studies, reports, videos
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Vitamin D meta-analyses of Virus studies
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VitaminDWiki pages with RSV in title (7 as of Nov 2022)
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RSV 11.8 X more likely to be life threatening if low Vitamin D – Feb 2022

RSV and Vitamin D in medical publications
Modulation of the Immune Response to Respiratory Viruses by Vitamin D - May 2014 https://doi.org/10.3390/nu7064240 FREE PDF
The interplay between vitamin D and viral infections January 2019 https://doi.org/10.1002/rmv.2032
Vitamin D in respiratory viral infections: a key immune modulator? Sep 2021 https://doi.org/10.1080/10408398.2021.1972407
Serum Vitamin D Levels and Life-Threatening Respiratory Syncytial Virus Infection in Previously Healthy Infants Sept 2022,
- https://doi.org/10.1093/infdis/jiac033 11.8X more likely if low vitamin D
Vitamin D Receptor polymorphisms and risk of enveloped virus infection: A meta-analysis - Dec 2018
Back to basics: review on vitamin D and respiratory viral infections including COVID-19 - Oct 2020
Comparison of Viral Agents and Vitamin D Levels in Children with Acute Bronchiolitis Infection. March 2019
Cord blood vitamin D deficiency is associated with respiratory syncytial virus bronchiolitis - June 2011 doi: [10.1542/peds.2010-3054]
Note: PDFs of many medical studies before 2020 are available at http://libgen.rs/scimag/
RSV - not just those under age 2, anticipate big outbreak after 2 years of isolation - Oct 29, 2022
R.S.V. Cases Are Rising. Here’s What You Need to Know - New York Times
"In a normal prepandemic year, 1 to 2 percent of babies younger than 6 months with an R.S.V. infection may need to be hospitalized. And virtually all children have gotten an R.S.V. infection by the time they are 2 years old."
“Adults still get R.S.V. fairly regularly and they can get reinfected multiple times throughout adulthood,”
"According to the Centers for Disease Control and Prevention, an estimated 177,000 older adults are hospitalized with R.S.V. each year and 14,000 of them die."
"Those at highest risk for severe infections include premature infants, babies under 6 months of age, infants and toddlers with chronic lung disease or congenital heart disease, as well as children with weakened immune systems and those who have neuromuscular disorders that make it difficult to clear out mucus."
- Note: Many of these are associated with low Vitamin D