The effect of innate immunity, cross-reactivity, trained immunity and vitamin D on Covid-19

On 17 May 2020 I had arrived at an Infection Fatality Rate (IFR) estimate of 0.5% after undertaking a review of serological studies. This estimate included an implicit estimate of around 10-15% of the population as being innately immune or having cross-reactivity (i.e. adaptive immunity acquired from other means, […]

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