Fig. 4

The PC scores plot and loadings plot from the PCA of 1500–1200 cm^− 1. ▲ P. insidiosum with an organic solvent (negative control), cc P. insidiosum treated by thimerosal (positive control), ■ P. insidiosum treated by anti-P. insidiosum that extracted from P. stutzeri ST1302, ● P. insidiosum treated by anti-P. insidiosum that extracted from K. pneumoniae ST2501, and ▼ P. insidiosum treated by xanthyletin