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Potential example of vaccine-induced sterilising immunity (Pony A#4 and A#7). SRH antibody response against A/equine/South Africa/4/03 (a) or A/equine/Richmond/1/07 (b); Pony A#4 and A#7 individual clinical signs of disease (c). Virus shedding was measured by titration in embryonated hens’ eggs (d). Positive clinical signs or virus shedding are indicated in bold text. ND = nasal discharge, ND extent U = unilateral and B = bilateral, ND type S = serous and M = mucopurulent.
