@Imfedupwithallofthis
No. This is a new virus. If you have no previous infection, you have no immunity whatsoever.
That's not true, there are people immune to at least one strain of HIV.
I had this explained to me but I can only remember the basics so in very simple terms a virus has to infect cells and then make the cell reproduce the virus that goes on to infect other cells.
At this point you do not have the disease and if your body's immune system can 'win the battle' you will not get ill.
Viruses come in various shapes and can only pass through the same shape to get into a cell. If you think of those toddler toys where you post the triangle through the triangular shape but it won't fit through the circle hole.
Our cells are similar, the virus has to 'fit' to your body's cells, some people will be missing one of the shapes so although the virus gets in to your body it can't get into the cells and can't reproduce.
But the virus can be passed on although not as effectively as if you have the disease.
If you look at the village of Eyam that isolated itself during the plague some people did not get the plague, one woman nursed her husband and children who all died, but she didn't because she had natural immunity.
Descendants of the Eyam survivors are often naturally immune to plague.
This is all ignoring the 'normal' response where antigens create an immune response. The immune response can give you some immunity to similar diseases eg flu.
We al know flu changes every year and that's why we need annual jabs. But if you do get flu then you are normally immune to flu for the next 2-3 years as the mutation is similar to the last year.