It's vaccines and all of the other toxins in the world that cause our low immune system.
Once one researches vaccine ingredients, the lightbulb turns on. It's not good. Edgar Crookshank proved it long ago that vaccines are a fraud. There's no reason to have egg, insect cells, human serum (I let you guess where they get these cells), bovine serum, dog serum, horse serum, monkey serum, (they use downer cattle from factory farms and euthanized animals from research labs), mycoplasms, bacteriophages, prions, mercury, aluminum, formaldehyde, etc. injected into our beloved companions or humans. Zero reason.