The study did not support the hypothesis of a causal link between vaccinations and chronic diseases and autoimmune diseases. Vaccinations do not weaken the immune system. A man can produce about 10 billion different antibodies. During the lifetime human organism produces from 1 to 100 million different antibodies. Vaccination creates antibodies to about 150 antigens. We describe the capacity of the infant's immune system to respond to vaccines as well as discuss the plausibility of theories that relate vaccines to the development if specific chronic disease.