Table 3.

Log₁₀ viral RNA copies of BCoV per gram tissue

Days post exposure	Calf	Medial retropharyngeal lymph node	Mesenteric lymph node	Lung	Ileum	Colon
22	E4	6.9	6.3	Not done	Not done	Not done
28	E2	6.7	Negative	Not done	Not done	Not done
35	E3	Negative	5.0	Negative	6.0	5.2
42	E1	6.2	7.4	Negative	7.0	6.0

Tissue samples from lymph nodes, lung, Ileum and Colon were harvested from exposed group calves euthanized at the indicated number of days after exposure to field group calves. The number of viral RNA copies (VRC) of BCoV was quantified with RT-qPCR and the limit of quantification was 4.2 log₁₀ VRC/g tissue