After you covid vaccine jab, your immune system is gear towards only one type of variant. When a different variant comes in, your immune system can't fight it.
In other words, your immune system become specialised to only one type of variant.
In other other words, the vaccine has downgraded your immune system to only fight one type of variant virus and no more.
In other other other words, the vaccine had handicapped the body's immune system.
My unvaxx natural immune system can fight any variants, no problem at all.