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    PeterDobias.com / Blog / stories & news

    Study on Duration of Immunity to Canine Vaccines

    By Dr. Peter Dobias, DVM

    Dr. Peter Dobias, DVM has 30 years of experience as a veterinarian. His love of dogs and passion for natural healing and nutrition led him to writing, teaching and helping people create health naturally, without drugs, chemicals and processed food.

    What vaccine companies don’t want dog guardians to know

    There have been many debates on vaccination in dogs. I hope this study will make you change your mind if you still vaccinate yearly.

    _______________________________________

    Ronald D. Schultz, Professor and Chair

    Department of Patho-biological Sciences
    School of Veterinary Medicine, University of Wisconsin-Madison

    It has been common practice since the development of canine vaccines in the late 1950′s to administer them annually. The recommendation to vaccinate annually was based on the assumption that immunity would wane in some dogs. Thus to ensure immunity in the population, all dogs required revaccination since it was not practical to test each animal for antibody. Little or no research has been done to demonstrate that the practice of annual revaccination has any scientific value in providing greater immunity than would be present if an animal was never revaccinated or was revaccinated at intervals longer than one year.

    In 1978 we recommended an ideal vaccination program would be one in which dogs and cats would be revaccinated at one year of age and then every third year thereafter (1). That recommendation was based on a general knowledge of vaccinal immunity, especially the importance of immunologic memory and on duration of protection after natural sub clinical or clinical infections as well as on limited studies we had performed with certain canine and feline vaccines.

    Since the mid 1970′s we have done a variety of studies with various canine vaccines to demonstrate their duration of immunity. From our studies it is apparent, at least to me, that the duration of immunity for the four most important canine vaccines (core vaccines) that the duration of immunity is considerably longer than one year.

    Furthermore, we have found that annual re-vaccination, with the vaccines that provide long term immunity, provides no demonstrable benefit and may increase the risk for adverse reactions. We have assessed duration of protective immunity primarily by two procedures; the first is held to be the “gold standard" and that is to challenge the vaccinated animal with the virulent organism, the second method is to measure antibody and compare the antibody titer to that which is known to prevent infection (e.g. provide sterile immunity). The studies we report here include challenge studies as well as studies that determine antibody titers.

    A summary of our results show the following (Table 1).

     

    Table 1: Minimum Duration of Immunity for Canine Vaccines
    Vaccine
    Minimum Duration of Immunity
    Methods Used to Determine Immunity
    CORE VACCINES
    Canine Distemper Virus (CDV
    Rockbom Strain 7 yrs / 15 yrs challenge / serology
    Onderstepoort Strain 5 yrs / 9 yrs challenge / serology
    Canine Adenovirus-2 (CAV-2) 7 yrs / 9 yrs challenge-CAV-1 / serology
    Canine Parvovirus-2 (CAV-2) 7 yrs challenge / serology
    Canine Rabies 3 yrs / 7yrs challenge / serology
    NON-CORE VACCINES
    Canine parainfluenza 3 yrs. serology
    Bordetella bronchiseptica 9 months challenge
    Leptospira interrogans ser. canicola ?
    Leptospira icterohaemorrhagiac ?
    Borrelia burgdorfen 1 yr. challenge
    Giardia ?
    Canine Coronavirus Lifetime (whether
    vaccinated or not
    vaccinated)
    Challenge / serology

     

    The minimum duration of immunity data does not imply that all vaccinated dogs will be immune for the period of time listed, nor does it suggest that immunity may not last longer (e.g. the life of the dog). The percentage of vaccinated animals protected from clinical disease after challenge with canine distemper virus, canine parvovirus and canine adenovirus in the present study was greater than 95 percent.

    Although there is much more that we need to know about duration of immunity to canine vaccines the information we have at present provides adequate justification for the vaccination recommendations that I and others have made and continue to make regarding frequency of vaccination (2)

     

    1. Schultz, RD. and F.W. Scott. Canine & Feline Immunization. In: Symposium on Practical Immunology. R.D. Schultz, Ed., Vet Clinics of N. Am., Nov. 1978, W.B. Saunders Co.

    2. Schultz, R.D. Current and Future Canine and feline vaccination programs. Vet Med 3: No. 3, 233-254, 1998.

    ________________________________________________________________________________________________

    For a holistic approach to dog vaccinations click here

    More articles:

    Kennel cough vaccine exposed

    Rabies Vaccines – Holistic Approach

     © Dr. Peter Dobias, DVM

     

    Product Reference

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    Dr. Peter Dobias, DVM has 30 years of experience as a veterinarian. He graduated as a Doctor of Veterinary Medicine in 1988 in the Czech Republic and obtained the Canadian Certificate of Qualification in 1995. He is currently licensed in the European Union, and his unique approach to healing and nutrition helps holistically minded dog lovers worldwide.

    Dr. Dobias strongly believes that disease prevention, natural nutrition and supplements, the right exercise and a drug free approach to medicine can add years to your dog's life.

    As a formulator of his all-natural vitamin and supplement line and co-inventor of natural, chemical free flea and tick control, FleaHex® and TickHex® his unique healing system and products currently hold the highest independent five star customer rating. For more information click here.

    Any general recommendations that Dr. Dobias makes are not a substitute for the appropriate veterinary care and are for informational and educational purposes only.

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