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Classical swine fever virus (CSFV) RNA detection by RT-qPCR in sow samples. (A) RNA levels detected in sera at different times post-infection. (B) RNA levels detected in tissues from sows infected with either the CSFV Margarita (black symbols) or PdR strain (grey symbols). Cycle threshold (Ct) values over 42 (dotted line) were considered as negative. Asterisk indicates the animal that was euthanised at 17 dpi.
