There's no such thing as "viruses" or "immune systems". So sorry, the "theory" remains unproven.
Until somebody can find a unicorn virus in nature, all the other nonsense that follows is meaningless. And until somebody can prove a contagious, pathogenic bacteria attacks a healthy person, which has never been demonstrated, then this fear-mongering idea of immunity is also an unproven theory.
There's no such thing as "viruses" or "immune systems". So sorry, the "theory" remains unproven.
Until somebody can find a unicorn virus in nature, all the other nonsense that follows is meaningless. And until somebody can prove a contagious, pathogenic bacteria attacks a healthy person, which has never been demonstrated, then this fear-mongering idea of immunity is also an unproven theory.