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You can't spread or transmit Covid19, you can only spread or transmit SARSCoV2 if symptomatic. Whether SARSCoV2 becomes symptomatic or even severe Covid19 in someone else depends on their Vitamin D levels. Point 2 of the #MonottiProtocol.
And prior cross reactive T-cell immunity in approximately 50% of the population. Probably vitamin D levels & cross reactive T-cell immunity work together in a synergistic way, as vitamin D boosts T-cells. That is what I would expect to a degree.
"Cross-reactive SARS-CoV-2 T-cell epitopes revealed preexisting T-cell responses in 81% of unexposed individuals, and validation of similarity to common cold human coronaviruses provided a functional basis for postulated heterologous immunity" https://www.researchsquare.com/article/rs-35331/v1
"When a T cell is exposed to a foreign pathogen, it extends a signalling device or 'antenna' known as a vitamin D receptor, with which it searches for vitamin D,", and if there is an inadequate vitamin D level, "they won't even begin to mobilize"
"High levels of vitamin D are also critical for first line immune defences including physical mucosal defences, human antiviral production, modulating cytokines, reducing blood clotting and a whole host of other important immune system functions"
VITAMIN D boosted T-CELLS, not 
lockdowns, not 
social distancing, not 
face masks really are the superstars in fighting #COVID19 https://www.bmj.com/content/370/bmj.m3563/rr-6
lockdowns, not social distancing, not face masks really are the superstars in fighting #COVID19 https://www.bmj.com/content/370/bmj.m3563/rr-6
"This review examines the compelling body of evidence strongly implicating varying levels of serum vitamin D levels in the significantly disparate outcomes between different groups of people and between different countries." https://osf.io/preprints/nutrixiv/73whx/
"The UK suffers from exceptionally high levels of vitamin D deficiency with serum levels averaging only 20ng/ml, half the optimal level."
"It examines the strong body of existing evidence connecting vitamin D deficiency to increased respiratory tract infections highlighting the central epigenetic role of vitamin D in immune system responses during a respiratory tract infection with SARS-CoV-2"
"Current UK guidelines recommend 400 IU of vitamin D per day whereas 6,000-10,000 IU per day is required to maintain blood levels of 40ng/ml, widely accepted as being the level required to support immunity, optimal health, and reduction in all-cause mortality."
"The financial cost of vitamin D deficiency in the UK has been estimated at around £20 billion per annum." https://osf.io/preprints/nutrixiv/73whx/
