Bovine Serum Albumin (BSA) is a protein found in cow blood. It is widely used in the manufacturing of vaccines as a form of nutrition to aid the growth of the bacteria or virus that is to be used in the vaccine and is a known allergen. Unfortunately, its protein structure is very similar to epithelial cells in certain animal species and because of this it is often cross-reactive with them. This means that if you are allergic to BSA your immune system will also over-react to the presence of the epithelial cells of other animals as well, due to their similarity. As BSA ends up as a component in the finished vaccine, if you vaccinate your child, you could be making him or her allergic to your family pet.
The international journal for biological sciences, the Biochimica et Biophysica Acta, noted that 30% of people who are allergic to animal epithelial cells, also known as dander when the skin cells are shed, are also allergic to Bovine Serum Albumin.The Journal of Investigative Allergology and Clinical Immunology shows just how cross reactive BSA can be across animal species when it states that it has shown to cross react with dog, cat, sheep and pig cells.
In the journal Pediatric Allergy Immunology, it clearly states that a person can become sensitised to animal epithelia without ever having come into contact with the animal.
“The first contact with SA (serum albumin) was through cow's milk and patients developed sensitization to epithelia SA even without direct contact with animals. Patients with both BSA and cow's milk allergy must avoid raw meats and furry pets.”
In this instance the author is tracing back the first contact with BSA to cow’s milk. However, ingesting BSA in cows milk is highly unlikely to sensitise a child to BSA unless they have a digestive order which permits undigested proteins to cross through the tight junctions in the in the intestines and enter the bloodstream where the immune system will then create antibodies to fight what it sees as a foreign substance. However, vaccines containing BSA protein, which are numerous due to the manufacturing process, will automatically bypass the digestive system and initiate the immune response due to their method of administration. This, after all, is what they are designed to do. When the person subsequently comes into contact with anything containing BSA or a substance it cross reacts with eg animal skin cells, they may have an allergic reaction.
Once a person becomes allergic to one type of animal’s epithelial cells, they can then become allergic to another due to cross-reactivity between the species. It has been noted, for example, that many patients who are allergic to cats are also allergic to dogs. Furthermore it has also been discovered that that people who are allergic to cats and dogs can also be allergic to horses.
There is also a well-known phenomenon called pork/cat syndrome where people allergic to pork are also allergic to cat dander as porcine serum albumin and cat albumin have very similar protein structures. The fact that porcine serum is also used in the production of vaccines highlights the probability that it is the act of vaccinating that actually causes a lot of pet allergies.
So if you vaccinate your child there may be a small chance that they may never be able to be pet owners.
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