5.5.9 What is herd immunity in foxes and how can it be determined?

By definition, herd immunity is the percentage of target animals protected against RABV as a result of ORV. Determination of herd immunity in red foxes is not as simple as that, however, in the context of rabies and ORV there is usually a good correlation between the level of rabies specific virus neutralizing antibodies (VNAs) and protection.

It is worth to note that a certain percentage of foxes that have not seroconverted might be protected against RABV. On the other hand, animals that have seroconverted after vaccination (usually low levels of VNAs) might not be protected at all. So seroconversion rates are rough estimation of the true herd immunity in foxes after ORV.


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Version 1 - Last updated November 2012