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Lab escape: The virus was developed during gain-of-function research and was released by accident.
Bioweapon: The virus was genetically engineered as a bioweapon and was deliberately released.
Zoonotic collection: The virus evolved in nature, and was contracted by virus researchers.
5-fold: Vitamin D reduces the odds for severe COVID-19 by a factor of around 5.
20-fold: Vitamin D reduces the odds for severe COVID-19 by a factor of around 20.
No Effect: Vitamin D has no effect on COVID-19 outcomes.