VIM and Lassa fever: In addition, the cells isolated from the HLF tissues or non-HLF tissues were identified as LF cells by the observation of cell morphology and immunofluorescence detection of LF makers expression (Additional file 1: Fig. S1), and the results showed that the isolated cells had a typical LF cells phenotype and uniformly expressed of LF cells markers (collagen I and Vimentin), suggesting that the isolated cells is the high purity of the LF cells.