Leucocytes are the white blood cells which fight infection.
Ms. Gibson demonstrates that the fluoride interferes with cellular metabolism at .5 parts per million or more. The white blood cells migrate through the blood looking for foreign invaders to destroy, but in the presence of fluoride, they start fizzling out. At .5 parts per million, the migration of leukocytes was 9.46 per cent less than it would have been. As Ms. Gibson pointed out, the significance is that there is enough interference in the immune system that fluoridation could make a difference to people who have weak immune systems because they have illnesses such as chronic fatigue syndrome, AIDS and cancer. Enforcing an equal amount of fluoridation for everybody in the public water system discriminates against people with weak immune systems.