In reality, childhood infections such as measles, whooping cough, chicken pox etc, are not caused by germs, but by the toxic conditions of the body, a condition known as Toxaemia.
Famous American physician, Dr Henry Bieler, author of ‘Food is Your Best Medicine’ writes, “The primary cause of disease is not germs. Disease is caused by a toxaemia which results in cellular impairment and breakdown, thus paving the way for the multiplication and onslaught of germs”.
Great link explaining the reasons why vaccines are ineffective. Really good compilation of data on that site.