I don't think that's true, but I can believe it is true to the general public. That being said I don't see how keeping the other 2/3 locked up is helping anyone, it just means that as people whose re more at risk decide to take their chances and not come out they'll be at even greater risk.
It's been discussed endlessly, the medical capacity etc.
But vitamin D is critical.
I just read this;
If I boost my immune system, will I have a greater chance at surviving Covid-19, and if so, apart from the immune system what else plays in role in helping me survive?
The immune system and your vitamin D blood level have a very close relationship. Those patients who died from Covid-19 coronavirus were the ones who had a vitamin D blood level of 15 ng/mL or less. Those who survived had vitamin D blood levels of more than 30 ng/mL. If you want an immune system that is tops, a vitamin D blood level of 50 to 80 ng/mL is recommended (the higher end of normal).
In a publication of 2006 Dr. John Cannell and co-workers have reviewed why influenza has seasonal outbreaks. They found that the innate immune system was very dependent on vitamin D3. Those who did not get enough sunlight in the northern hemisphere during January, February, March and April have an average 25-hydroxy vitamin D level of only 15 to 17 ng/mL.
In contrast, from July to September the same volunteers had vitamin D levels of 24 to 29 ng/mL. The authors stressed that this was the reason why in the late winter/early spring flu seasons come and go every year while in summer they disappear. Vitamin D is essential for the functioning of the innate and adaptive immune system. This is true not only for the flu, but also for Covid-19 coronavirus.
Here is my answer to your question: “If I boost my immune system, will I have a greater chance at surviving Covid-19, and if so, apart from the immune system what else plays a role in helping me survive?” We have known for a long time that a strong immune system is desirable to overcome flus and infections. But now with the Covid-19 coronavirus epidemic it is again clear that people who have compromised immune systems are the ones that will suffer the most and possibly even die. It is the old and the ones who have other chronic diseases (diabetes, autoimmune diseases, kidney diseases, COPD). They often are vitamin D deficient. Vitamin D3 is a powerful tool to strengthen your immune system. The “vitamin D hammer” can prevent viral pneumonia from happening. This leads to better survival.
Here are some peer-reviewed publications on vitamin D:
https://www.mdpi.com/2072-6643/12/4/988/htmhttps://www.clinicaltherapeutics.com/article/S0149-2918(17)30235-7/fulltexthttps://www.researchsquare.com/article/rs-21211/v1