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The results showed that the viral RNA was still detectable in cervical lymph nodes, mandibular lymph nodes and tonsils collected from both inoculated and contact pigs at 28 days post infection. There was no detectable viral RNA in the soft palate or pharynx, which are thought to be tissue sites for viral persistence in cattle.
Further study is needed to clarify whether this difference has significance in terms of viral clearance in pigs.
Z. Zhang and J. B. Bashiruddin. Quantitative analysis of foot-and-mouth disease virus RNA duration in tissues of experimentally infected pigs. The Veterinary Journal. 2009. Vol. 180 (1): 130-132.
