Peste Des Petits Ruminants Virus
A stock of PPRV Malig (Yemen) was originally obtained from The Pirbright Institute (Pirbright, U.K.).
The viral stock was passaged four times in Vero cells (ATCC) in Dulbecco’s Modified Eagle’s Medium (DMEM) supplemented with 10% fetal bovine serum (FBS) (Multicell Media-Gibco-BRL-USA) and 1% Penicillin/Streptomycin solution (Multicell) in a 37°C incubator with 5% CO2.
After the third passage, transmission electron microscopy (TEM) was performed to confirm that the virus was still displaying the structural integrity typical of members of the family Paramyxoviridae.
After the fourth passage, 80%–90% of cells exhibited cytopathic effect (CPE) after 17 days. Infected cells and supernatant were harvested and frozen at −70°C for subsequent challenge experiments.
The virus stock was titrated using Vero cells and the TCID50 values were determined based on the method of Reed and Muench [27].