The vaccine relies on the human immune response to fight the disease it learned. If there is a health-pandemic, that suppresses the imune-system (like unrecogn

The vaccine relies on the human immune response to fight the disease it learned. If there is a health-pandemic, that suppresses the imune-system (like unrecognized diabetes/ vitamin-d deficiency / rheumatic suppression medication) the disease will wage its attack against a weakened imune-system. Which creates ideal conditions for a full disease break-through. So Covid only highlights all sorts of failing health systems.