Histology and Immunohistochemistry
One sheep and one goat were euthanized and submitted to a necropsy procedure on each of dpi 6, 8, and 11.
Tissues were fixed in 10% neutral phosphate-buffered formalin. Sections were stained with haematoxylin and eosin (HE).
For immunohistochemistry, paraffin tissue sections were quenched for 10 minutes in aqueous 3% H2O2, then pretreated with proteinase K for 10 minutes.
Primary antibody, a monoclonal antibody raised against PPRV strain Nigeria 75/1 (generously provided by the USDA, Plum Island, USA), was used at a 1:1000 dilution in 10% normal goat serum and Tris-buffered saline/0.05% Tween 20 (TBST) solution overnight at 4°C.
Labelled tissue sections were then stained using a horseradish peroxidase-labelled polymer (Envision®+system [anti-mouse] [Dako, USA]), reacted with the chromogen, diaminobenzidine (DAB). The sections were then counter-stained with Gill’s hematoxylin.