6/21/2023 0 Comments Flock of chickens![]() ![]() In addition, the potential for new variants can result from reassortants between wild-t ype and vaccine strains making it even more difficult to treat affected poultry. Many vaccines are available for commercial poultry that aren’t appropriate for backyard poultry.įor example, live vaccines against infectious bronchitis (IB) and infectious lagyngotracheitis (ILT) can actually “revert to virulence.” This would cause an outbreak of disease that can spread beyond the vaccinated flock. Vaccination in backyard poultry can be somewhat confusing and challenging. (This is why pharmaceutical companies periodically have to, ever so slightly, change the vaccine to keep up with the latest-and-greatest version of the disease-causing agent.) Which Ones? So could mismatch between the vaccine strain and the strain to which the birds were exposed. Improper storage/preparation of the vaccine could be to blame. Vaccine failure can happen for several reasons. Psychologically, we remember “vaccine failure” (i.e., we gave our chicken a Marek’s disease vaccine and the chicken ended up contracting Marek’s) versus all the times we had vaccinated birds that didn’t get Marek’s. This has caused some people to become skeptical of their efficacy. (After all, nothing in medicine works 100 percent of the time.) ![]() One thing that makes vaccines complicated? That they don’t work 100 percent of the time. (Note: mRNA and subunit vaccines work a little different than how more traditional vaccines work, which I just described.) However, the vaccine strain is purposely a mild form as opposed to a virulent form that can cause disease and death. When you vaccinate, you essentially produce a mild form of the disease in order to elicit an immune response in your chickens. ![]()
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