Page 821 - Veterinary Immunology, 10th Edition

animals can permit the spread of disease and disrupt control
VetBooks.ir programs. Likewise, problems can arise if the unprotected animals

are individually important, such as companion animals. In contrast,
for diseases that are inefficiently spread, such as rabies, 70%

protection may be sufficient to effectively block disease
transmission within a population and may therefore be quite
satisfactory from a community health viewpoint.

FIG. 25.2 The normal distribution of protective immune responses
in a population of vaccinated animals. No vaccine can be expected
to protect 100% of a population.

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