<prompt> All of the following ae used as continuous cell lines in culture and isolation of viruses, EXCEPT:LLC-MK2Hep-2WT-38HeLa  <response>: Isolation of viruses in cell culture is recommended as the gold standard for a definitive aetiological diagnosis. LLC-MK2, Vero cell lines, HeLa cells, Hep-2 are used as continuous cell lines. The two cell lines Vero and LLC-MK2 displayed identical efficacy in the early detection of the mumps virus, with 100 of the samples showing positive in both cell lines at 48 hours of incubation. Thus, the shell l method provides a notable reduction in the time needed for the isolation of the virus compared with that required by the conventional tube culture method. 