There are two answers to this question: yes and maybe.
Yes, vaccines do cause cancer in pets, particularly in cats. About 15 years ago it was discovered that there was an increased incidence of a type of cancer called sarcoma in cats. Careful examination of these tumors revealed that many of them had arisen as a result of repeated injections, most commonly vaccines (often rabies vaccines or feline leukemia vaccines.) As a result of this discovery, and the discovery that most vaccines can produce immunity in pets that last for many years, conventional veterinary experts changed their vaccine recommendations from annual to every three years.
Currently, the conventional recommendation, which is also being taught in veterinary schools, is to vaccinate most pets every three years rather than every 12 months. Adapting these new vaccine recommendations has resulted in a decreased incidence of sarcoma cancers in cats. (Note-holistic veterinarians like myself vaccinate even less frequently than every three years. We accept the fact that vaccines produce excellent immunity that can last for 5 years, 10 years, or even the life of the pet. As a result, we do a blood antibody test called a titer test each year and only vaccinate our patients if and when this titer test is negative.)
Maybe vaccines may also cause other types of cancers. While proof is lacking, common sense tells us that whenever we administer something to a pet that could negatively interact with his immune system, bad consequences can occur. Cancers, autoimmune disorders, and chronic illnesses can occur as a result of damage to a pet’s DNA and chronic oxidation and inflammation. All of us have seen way too many pets who developed cancer shortly after being vaccinated. Oncologists warn against vaccinating pets with cancer as negative interactions between the vaccine and the pet’s immune system can bring the pet out of remission and causes its cancer to grow and spread more quickly.
The most sensible conclusion is to only vaccinate healthy pets if and when their bodies tell us they require immunization. There is no reason for pet owners to continue to spend money needlessly on vaccines which will not help the pet but may cause harm, even causing the pet to develop cancer. An inexpensive and simple blood antibody titer test done every year by your veterinarian will reduce your pet’s need for vaccines and lower its risk of developing cancer and other serious immune disorders.
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