Immunity - Dr. A answers your questions

The last three COVID - Delta updates have triggered a LOT of questions to Dr. A, so he thought he'd answer them. The 'Theme' is your immune system. Some headings are:<br />- How does the immune system work again?<br />- Can you (should you) "boost" immunity?<br />- If I'm sick and I also have autoimmunity what do I need to look out for?<br />- My doctor told me my medication lowers my immunity, why?<br />- You mentioned things that block or slow COVID viral uptake by our cells, how?<br />- You said zinc needs to get into the cells to help with viral infections, how do we do that?<br />- If I'm taking all these immune supplements will I not get COVID?<br />- Can you explain again HOW Vitamin A&D helps with immunity?<br />- My doctor told me vitamins A&D were potentially toxic and not to take them, why?<br />- One more time, HOW can a fully vaccinated person still 'get' COVID?