Do they tho or is it a placebo effect?
  'One of the most disconcerting discoveries in clinical medicine was the finding that children with congenital agammaglobulinaemia, who could make no antibody and had only insignificant traces of immunoglobulin in circulation, contracted measles in normal fashion, showed the usual sequence of symptoms and signs, and were subsequently immune. No measles anti-body was detectable in their serum (the water part of blood minus clotting factors and cells).[3]' [2013 Jan] Melanie’s Marvelous Measles: Is the provaccine backlash rational or hysterical? by Suzanne Humphries, MD
Also 
![image.png](https://images.hive.blog/DQmWJkifegKr7PAyzztuLmZB6V4d9ifLHt3Y5J3d44c3eRr/image.png)
[2004] Merrill W. Chase, 98, Scientist Who Advanced Immunology
http://whale.to/c/merrill_w.html


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