So obviously there has been a lot of attention on older people and those with comorbidities being at greater risk of serious illness, but what about an individual's risk profile changing throughout the year? I haven't heard much about that.
In particular, for people living in northern climates, is your risk of a more significant case elevated in the colder months when you are more likely to have lower vitamin D levels? After all, D is one thing that is thought to play a key role in immune health.